Creatinine Normal Range


Serum creatinine levels vary in children. The normal range for creatinine in the blood may be 0. It is frequently difficult to obtain substantial volumes of blood or urine from pediatric patients. The creatinine blood test does not measure muscle health, however. Normal creatinine range is:. Creatinine is a waste product that comes from the normal wear and tear on muscles of the body. Both are needed to compute (just google the formula) for the the creatine clearance, defined as a calculated measue of glomerular filtration rate, reflecting how well the kidneys remove creatinine from the blood. Pathogenicity and virulence of the present hantaviruses in Bosnia and Herzegovina: the impact on renal function. Endocrinology Handbook. Creatine and Creatinine. Body weight: Blood creatinine increases with the body weight in dogs. In most cases of chronic renal disease the ratio remains relatively normal. According to the U. BUN Creatinine Ratio can help a physician to decide what has caused your renal failure or if you have renal failure at all. Results of the creatinine blood test are measured in milligrams per deciliter or micromoles per liter. Creatinine is produced in your body at a consistent rate, it is not affected by your diet or normal physical activities. BUN/creatinine will reduce as well. It is the first time I had a low reading. As the kidneys become impaired for any reason, the creatinine level in the blood will rise due to poor clearance of creatinine by the kidneys. ACR 10-30 mg/g (1-3 mg/mmol) is considered high normal. Creatinine Urine Test. The normal level of urine creatinine in case of a random test may range between 40 to 300 mg/dL in males and 37 to 250 mg/dL in females. The ratio may be used to determine the cause of acute kidney injury. If the kidneys are not working well there is more creatinine in the blood. A urine creatinine test measures the amount of. Creatinine is produced during the normal breakdown of muscle tissue, and because it is produced at a relatively steady rate, labs can use it as a marker to see how well your kidneys are functioning. Updated: March 2010. When the kidneys are not working well, creatinine builds up in the blood. Questions will usually include critical lab values and it's a matter of identifying if it's within normal range or not. 3 to 107 micromoles per liter), although this can vary from lab to lab, between men and women, and by age. Creatinine - normal range 45 -90 umol/L This is the most common test used to measure kidney function. Low creatinine levels could indicate a problem with. I am tensed that my creatinine level is almost high for a 24 year old male , although the normal range is between 0. For the adult male, the normal range is 0. Creatinine level helps to reflect kidney functions and usually, the higher the creatinine is, the poorer the kidney functions are. Creatinine - normal range 45 -90 umol/L This is the most common test used to measure kidney function. First, different machines have different normal ranges for blood values. We'll explain the. history and creatinine level. Creatinine is produced as the result of normal muscle metabolism. In adult males, the normal levels of creatinine in the blood are in the range of 0. She also has normal ALT levels. A normal level is important to avoid kidney related diseases. Clinical laboratory test results are within the normal range at the Screening Visit, or if abnormal, are not clinically significant, in the opinion of the Investigator. the upper limits of the normal range or perhaps be minimally elevated in an unimpaired elderly applicant. Phosphocreatine is burned as a quick source of energy by our cells. The blood creatinine levels are increased in kidney diseases and transiently after you take meat. 5 mg/dl, or 70 to 133 μmol/L by the older manual Jaffé reaction. Creatinine, also a waste product, is the second key indicator of overall kidney health. What is a normal level of creatinine? That depends on your age, race, gender, and body size. However, age and sex have significant impact to amount of creatinine in urine and children and adults are definitively going to have different results. These numbers rarely ever change unless there is a problem. Normal GFR range means normal kidney function while low GFR level means that your kidney function is low. As kidney disease gets worse, the level of creatinine goes up. A normal level is important to avoid kidney related diseases. 9 mg/dl in females. Since I have high blood pressure and was on medication , it went up considerably two weeks ago - 160/110 - so I doubled the dose. The range for "normal" varies from lab to lab. Thus the amount of creatinine produced is in large part dependent upon the individual's muscle mass and tends not to fluctuate much from day-to-day. 2 for 2 years or older. You may need to collect your urine for 24 hours in a jug. Total Bilirubin. Could this be a sign of kidney impairment? I've read that both would be elevated, but I'd like to confirm. Spot urine creatinine is pretty much usless on its own: the range of possible values is so incredibly wide. In normal subjects the urinary calcium/creatinine ratio wasfound to be independent ofurine concentration. Low creatinine: Small stature, debilitation, decreased muscle mass; some complex cases of severe hepatic disease can cause low serum creatinine levels. Albumin-to-creatinine ratio, urine Less than 30 mg/g ABIM Laboratory Test Reference Ranges [therapeutic range for standard (unfractionated) heparin therapy]. 5 mg/dL to 1. A normal outcome is 0. The normal levels are roughly the same for people over 60. The results were compared to the laboratory. The normal serum creatinine (s Cr) varies with the subject's body muscle mass and with the technique used to measure it. Your weight also needs to be controlled. I'm still waiting for insurance approval. significant renal disease with creatinine within the reference range. You can find more ways to lower creatinine level from here. Creatinine is the ideal substance for determining renal clearance because a fairly constant quantity is produced within the body. The dietary advice you are given depends on a number of factors including the stage of kidney disease, the type of treatment you are on, your blood results, your body weight, and the presence of other medical conditions e. Results of the 24h creatinine test are typically reported in g/24h (grams of creatinine in the urine over 24 hours). 1 mg/dl; Depending on the level of muscle development, the normal creatinine levels in infants are. Creatinine [Creat] This is the best routine blood test for measuring how well kidneys are working. 0 creatinine Visipaque(with option of reduced volume) 3. Men and women have different normal values for blood creatinine tests. As mentioned earlier in this random creatinine test, a sample of urine is obtained from the patient and a test is conducted over it in the lab to check the creatinine content. In China, the normal range in most cases is 44 to 103 umol/L. "Normal" GFR is approximately 100 but you will often see it reported as >90 (greater than 90) or >60 (greater than 60). Normal Adult Range:. The normal function of CK in our cells is to add a phosphate group to creatine, turning it into the high-energy molecule phosphocreatine. The level of creatinine in your urine is an indicator of how well your kidneys are functioning. Hello, the creatinine clearance rate of 2. The eGFR is calculated with the CKD EPI equation using the serum creatinine, age, gender and race of the patient. Normal random urine creatinine concentrations range from 40-300 mg/dL in males and 37-250 mg/dL in females. In Evaluating Patients with Diabetes for Kidney Disease. If a patient with poor renal function on both sides lost a kidney the creatinine would go up. If your creatinine level is increased, how to lower creatinine level in blood? How to Lower Creatinine Naturally. My father 59/M is a diabetic since last 20 years and recently has been diagnosed with hypertension, his S. The creatinine is used as an approximation of the glomerular filtration rate (GFR). The BUN/creatinine ratio is also a useful indicator of disease. Abbreviations: ACR, (micro)albumin}creatinine ratio; EMU, early morning urine. 21 milligrams per deciliter (74. Is the age-related decline in renal function that causes a decrease in creatinine clearance a result of normal aging or disease? That depends on how you define elderly. Lab Tests Online reports the reference ranges for creatinine production as: male 80 – 115 µmol/L (0. In normal subjects the urinary calcium/creatinine ratio wasfound to be independent ofurine concentration. Insulin, glucagon, thyroid hormone, liver enzymes and adrenal hormones regulate it. Healthy kidneys take creatinine out of the blood and remove it into the urine to leave the body. Please note: gender influences the normal range of the creatinine level. It is frequently difficult to obtain substantial volumes of blood or urine from pediatric patients. In general, normal pathology values are readily available for healthy term infants. Serum potassium should be maintained within the normal range before TIKOSYN treatment is initiated and should be maintained within the normal range while the patient remains on TIKOSYN therapy. A “normal” blood glucose level comes in at around 4 – 7 mmol/L or 4 – 8 mmol/L for a child with Type 1 diabetes before meals. creatinine (JlmoljL) +1 +3 +22 +2 +22 +175 o +7 +4 +6 +29 + 175 Creatinine paediatric reference ranges 101 The method used in this study for the measure­ ment of serum creatinine has good precision at low levels. A urinary creatinine clearance is more accurate if the urine collection is complete. My protein, bacteria and blood was normal for my urine sample. Creatinine is a waste product produced by muscles from the breakdown of a compound called creatine. Your lab report should contain the range your lab uses. creatinine Nephrology The end product of creatine metabolism, which is excreted into the urine; creatinine can be used to diagnose and monitor renal failure; creatinine may be measured in amniotic fluid to determine gestational age–fetal maturity index; normal ranges vary according to the lab. Transamerica Reinsurance, an AEGON Company, explains that urea levels in the elderly may be slightly higher than that of a healthy adult. The normal ratio range for the BUN to creatinine is commonly between 10:1 and 20:1. 5 mg/dl, or 70 to 133 μmol/L by the older manual Jaffé reaction. Creatinine Unit Conversion between mg/dL and µmol/L. 1 mg/dL for women. Your calculations are spot on. To learn more about the normal range of urine creatinine and creatinine in the blood as well as what abnormal levels may indicate, continue reading. This table lists reference values for the most common laboratory tests and is intended for interpretation of the results as they are provided in the examination. *Single kidney with. These numbers rarely ever change unless there is a problem. New adult reference ranges for serum creatinine Current New. Acute Post-streptococcal Glomerulonephritis with Normal Range Complement C3 Level: Three Case Reports GL QIAN, L HUANG, JH MAO, AM LIU Abstract Introduction: Acute post-streptococcal glomerulonephritis (APSGN) is a common disease that primarily affects children. Serum creatinine levels were within the normal range for most of the subjects identified with reduced GFR. Looking for online definition of creatinine or what creatinine stands for? creatinine is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms The Free Dictionary. View test prices, normal range, sample results and user reviews about labs only on 1mg. As a general rule, low creatinine levels (lower than the normal range) is not of concern compared to high creatinine and merely indicates a very efficient pair of kidneys, or in some cases pregnancy. As your serum creatinine is normal, you should not bother about those reports. A normal creatinine level ranges from 0. There are tests available to measure the amount of creatinine being removed through your kidneys. The test is used to assess kidney health. Persistently high levels of creatinine indicate that the kidneys may not be functioning properly due to kidney damage or disease. The BUN/Cr ratio is normal at 10 to 15:1 in ATN (intrarenal), but is often greater than 20:1 in prerenal disease due to the increase in the passive reabsorption of urea that follows the enhanced. On the other side,the normal albumin creatinine ratio in women is around 25 mg/g of creatinine. 3 mg/dL for men and 0. Creatinine is a chemical waste product of creatine, an amino acid made by the liver and stored in the liver. Repeat using early am sample. 1 mg per dL for adult females. 85 mg/ dL equals creatinine equals creatinine 163 umol/L. 2 milligrams/deciliters (mg/dL) and 0. National Library of Medicine, familial lipoprotein lipase deficiency is diagnosed in part through absent or low lipase levels. High-protein diets may cause abnormally high BUN levels, while low-protein diets may lead to low BUN levels. Polycystic means "many cysts," and this disorder is characterized by cysts in both kidneys (bilateral renal cysts). Normal GFR range means normal kidney function while low GFR level means that your kidney function is low. Normal ranges may vary with age too. The detection of low levels of albumin excretion (microalbuminuria) has been linked to the identification of incipient diabetic kidney disease. This article will introduce to you normal creatinine range. Creatine and creatinine are metabolized in the kidneys, muscle, liver, and pancreas. Normal blood creatinine levels are: Men: 0. The urine test measures the amount of protein unfiltered by the kidneys and is used to detect early signs of kidney damage. Polycystic means "many cysts," and this disorder is characterized by cysts in both kidneys (bilateral renal cysts). 5-2x normal or control value Partial thromboplastin Time (aPTT) (Heparin) 16-40 range; therapeutic range 1. In addition, PRO-NS improved the SOD activity and glutathione content of liver and EAC cells. Serum Creatinine: Creatinine is a waste product in your blood that comes from muscle activity. A certain level of creatinine is expected to be in the blood of a dog and a range of "normals" has been established to recognize this. Creatinine values may vary according to sex, height and weight of the individual. Normal Ranges for Creatinine Blood Test. We can measure this by-product in the blood. The normal range for creatinine levels will vary based on whether you are an adult male, adult female, teenager, or child. My 5 year old Shih Tzu has elevated creatinine levels but normal to low BUN levels. When I was lifting weights daily, I ran 1. Elevation of serum creatinine is not a normal feature of ageing, nor is advanced age a contraindication to referral. Creatinine is a waste product produced by muscles from the breakdown of a compound called creatine. Creatinine is a more reliable indicator of renal function than BUN because it is less influenced by other factors such as diet and hydration. Veterinarians measure creatinine levels because it helps to identify kidney problems. Age and gender could also affect the levels of creatinine but this should be within the normal parameters. Lab Tests Online reports the reference ranges for creatinine production as: male 80 – 115 µmol/L (0. Urine Microalbumin To Creatinine Ratio Calculator. 2 mg/dl is within the normal range. Another way of expressing the normal range for these test results are: 14 to 26 mg per kg of body mass per day for men; 11 to 20 mg per kg of body mass per day for women. Her creatinine level was 7. Nitrite: Nitrite is not a normal component of human urine. The goal of this site is to be an educational resource on veterinary clinical pathology – an “on-line” textbook as it were. , gastrointestinal bleeding, trauma, etc. Increased urea formation also results in an increase in the ratio, e. 3 to 107 micromoles per liter), although this can vary from lab to lab, between men and women, and by age. Microalbuminuria is defined as excretion of 30-300 mg of albumin per 24 hours (or 20-200 mcg/min or 30-300 mcg/mg creatinine) on 2 of 3 urine collections. Creatinine is a chemical waste product of creatine. Creatinine is the waste product of creatine phosphate, which is found in skeletal muscle. Polycystic means "many cysts," and this disorder is characterized by cysts in both kidneys (bilateral renal cysts). Insulin, glucagon, thyroid hormone, liver enzymes and adrenal hormones regulate it. The causes may be anything ranging from dehydration or lowered blood supply to kidneys due to any reason like heart disease. This test can be used for the. The serum creatinine can vary by 0. Medications as well a healthy diet and lifestyle modifications are helping to get the normal creatinine levels. Veterinarians measure creatinine levels because it helps to identify kidney problems. In this Protein creatinine ratio range calculator just enter the values for protein and creatinine and submit to know the ratio and to take suitable measures to avoid future complications. The normal glomerular filtration rate value ranges might vary slightly from laboratory to laboratory. The level of creatinine in your urine is an indicator of how well your kidneys are functioning. mg/dL Normal (Reference Range) = 0. 6 mg/dL, or 141 µmol/L), this generally means that there is a problem with the kidneys. GP is not remotely concerned, but I have referred myself to BUPA and my appointment is in 2 weeks. The value you should be at may vary further based on your age and body size, but there are general ranges you should shoot for. For convenience, this is referred to as 100% of kidney function. The normal ratio range for the BUN to creatinine is commonly between 10:1 and 20:1. The causes may be anything ranging from dehydration or lowered blood supply to kidneys due to any reason like heart disease. The normal range is 6 to 25, with 15. Creatinine Urine Test. The normal range is 0. If creatinine levels are higher than normal, kidney function could be impaired. Men tend to have higher levels of creatinine than women because of the comparative excess of body muscle. WebMD Medical Reference. Is creatinine 300 high for chronic kidney disease? Creatinine is the product from muscle’s metabolism which occurs in human body. 3mg/dl for men and 0. The creatinine clearance is a widely used test to estimate the glomerular filtration rate (GFR) []. Please note that different medical laboratories have different evaluation standards for finding the normal lymphocyte count. As a general rule, low creatinine levels (lower than the normal range) is not of concern compared to high creatinine and merely indicates a very efficient pair of kidneys, or in some cases pregnancy. View details of test: When to take, What is the normal range & Get reports Online. Blood urea nitrogen (BUN) is often ordered with creatinine for comparison. Low creatinine levels could indicate a problem with. Creatinine is a waste product from the normal breakdown of muscles in your body. This is because women usually have less muscle mass than men. 20g muscle can produce 1mg creatinine. Hi, please get creatinine repeated after 2weeks and he should take plenty of fluids. 8 µmol/kg/day). 5 - 6 miliIU/L Optimal Adult Reading: 3. You may need to collect your urine for 24 hours in a jug. Estimate glomerular filtration rate (creatinine clearance) from serum creatinine, the patient's height, and a proportionality constant using the original Schwartz method. Normal range: Males - 0. Hematology Ranges: PCV: 35 - 50 %: WBC: 4 - 10 x10 3 / µL: Heterophils: 30 - 70 %. In normal case, creatinine level should be lower than 1. Creatinine is a substance that is a by-product of the breakdown of an amino acid called creatine. As (extreme) prematurity is a pathological condition in itself, be cautious when using the concept of 'normal'. 11-14 seconds: therapeutic range 1. Previous studies. creatinine ratio dipsticks (Clinitek® Microalbumin) read on the Clinitek® 50 urine chemistry analyser. I had a creatinine test, and the result was 1. BUN Creatinine Ratio can help a physician to decide what has caused your renal failure or if you have renal failure at all. However, the normal function of CK isn't as relevant, in this case, as what happens to CK when muscle is damaged. 5 mg/dL to 1. Most of the patients have serum creatinine level between 7. Reference Range: eGFR (ages 18-70): >60 mL/min/1. Pregnancy and laboratory studies: a reference table for clinicians. (Samples less than 30 mg/dL are generally considered too dilute to be an accurate urine test for any other measures; above 300 mg/dL is usually considered to concetrated to be of any valid lab use. This test can be used for the. Men have more chances of a high creatinine level than women. This table lists reference ranges (expressed in both SI units and traditional units) for the most common laboratory tests and is intended for interpretation of the results as they are provided in the examinati ons. Importantly, patients with an eGFR >60 ml/min/1. 3 milligrams per deciliter in men, states MedlinePlus. Spectrophotometry or IDMS), resulting in more accurate and standardized creatinine results. When there is decreased formation of urea as seen in liver disease, there is a decrease in the BUN/Creatinine ratio. BUN/creatinine will reduce as well. It is sometimes low in subjects with relatively small muscle mass, cachectic patients, amputees, and in older persons. The normal ratio range for the BUN to creatinine is commonly between 10:1 and 20:1. Creatinine levels can be measured by a simple blood test or urine test, which would thereby assess the function of the kidney. Normal random urine creatinine concentrations range from 40-300 mg/dL in males and 37-250 mg/dL in females.     Creatinine is not protein-bound and is freely filtered by glomeruli. clearance) of creatinine from the body. This test measures the amount of creatinine in the blood and/or urine. 2 mg/dL (60-110 μmol/L). क्रिएटिनिन टेस्ट की कीमत – creatinine test cost in Hindi 12. Creatinine is a normal waste product in your urine. I had a creatinine test, and the result was 1. It is checked to see how well your kidneys are working. An abnormal creatinine clearance rate may mean you have a problem with your kidneys. Urine Microalbumin To Creatinine Ratio Calculator. Creatinine clearance. "Normal" GFR is approximately 100 but you will often see it reported as >90 (greater than 90) or >60 (greater than 60). Repeat using early am sample. Creatinine clearance; Creatinine urine; Blood urea nitrogen (BUN): The BUN test measures the nitrogen content in blood urea. 0 doc said its possible kidney failure however this is her first bad lab work. The amount of. Can my healthcare provider know if my kidneys are working properly by looking at how much creatinine is in my blood?. CREATININE RATIO, URINE (Immunoturbidimetry, Spectrophotometry) Microalbumin Creatinine Microalbumin : Creatinine Ratio - - - mg/L mg/dL mg/g creatinine < 30 Link with gender GENDER CREATININE VALUE IN mg /dL Male 39 -259 Female 28 -217 CATEGORY REFERENCE RANGE IN mg/g CREATININE Normal / Non diabetic < 30 Microalbuminuria 30-300. The kidneys are responsible for keeping the level of creatinine in the blood within a normal range. As (extreme) prematurity is a pathological condition in itself, be cautious when using the concept of 'normal'. Microalbuminuria is the medical term for the highalbumin creatinine ratio that ranges from 35 to 300 mg/g of creatinine. Reducing urine albumin to the normal or near-normal range may improve renal and cardiovascular prognoses. Electrolytes are in normal range. Creatinine is a waste product from the normal breakdown of muscle tissue. Blood levels of albumin and creatinine are both independent markers of survival in patients with amyotrophic lateral sclerosis (ALS), a new study suggests. 4 creatinine Normal volume and type of contrast indicated for CT 2. The normal ratio range for the BUN to creatinine is commonly between 10:1 and 20:1. 0 creatinine Visipaque(with option of reduced volume) 3. 2 mg/dl, or 53 to 106 μmol/L by the kinetic or enzymatic method, and 0. 73m2, range 4. However, due to worldwide. The normal range for creatinine in the blood may be 0. Thus, a random urine protein/urine creatinine ratio of <0. As with creatinine, creatinine clearance is slightly lower in children and the elderly. creatinine ratio dipsticks (Clinitek® Microalbumin) read on the Clinitek® 50 urine chemistry analyser. This is due to the fact that women generally have less muscle mass than men. USA Mobile Drug Testing recommends breath alcohol testing for workplace. They are used to screen for kidney disease in people with risk factors, such as diabetes and high blood pressure. Book Creatinine In Chennai online from Bioline Laboratory. Creatinine production and excretion is directly related to muscle mass and is sex and age dependent. Normal random urine creatinine levels range from 40 to 300 mg/dl but it should be kept in mind that this range is somewhat dependent on the individual's sex, age and if there are other mitigating. A BUN level greater than 85 mg/dL with a normal creatinine level may indicate a loss of 2 or more units of blood into the GI tract. In patients with creatinine in the upper normal level, cystatin C might be a more sensitive predicto. It is generally believed that creatinine 1. For convenience, this is referred to as 100% of kidney function. If creatinine is high, it means the kidneys are not functioning properly. Creatinine is the waste product derived from muscle creatinine and is released into the blood at a relatively constant rate. " Notice the "always. Normal range for lab tests are the established and acceptable values within which the test results for a healthy person are expected to fall. Another factor that can affect BUN results is your protein intake. NCLEX will not give you values that are within normal range. In advanced liver disease, low creatinine may result from decreased hepatic production of creatinine and inadequate dietary protein as well as reduced muscle mass. 1 mg/dL under the age group of 18 to 60 years old. Result of normal serum creatinine is 0. Often doctors prescribe only to study the level of ALT and AST in the blood — liver function tests. Normal ranges are 0. Previous studies. It is the first time I had a low reading. -Normal childbirth causes a 6-fold elevation in maternal serum. Normal ranges may vary with age too. If kidney function is not normal, creatinine level in your urine decreases. Charing Cross, Hammersmith and St. Urea is the principal nitrogenous waste product of metabolism and is generated from protein breakdown. This test compares creatinine in your blood and urine. Please note that different medical laboratories have different evaluation standards for finding the normal lymphocyte count. 32 ml per sec / m2 IU) Women: From 88 to 128 ml per min / 1. ALERT VALUES DUKE UNIVERSITY HEALTH SYSTEM CLINICAL LABORATORIES. As with creatinine, creatinine clearance is slightly lower in children and the elderly. This calculation is known as your estimated glomerular filtration rate (eGFR). Thus, a random urine protein/urine creatinine ratio of <0. However, nitrite found in urine may indicate urinary tract infections or bacterial infections. Creatinine Classification. Useful Information. Creatinine is a breakdown product of creatinine phosphate in muscle and is usually produced at a fairly constant rate by the body, depending on muscle mass. A microalbumin urine test can detect kidney disease early on and help you prevent more serious problems. After testing, your doctor will tell you if your creatinine levels are high, normal, or low. diabetes mellitus, high cholesterol levels. creatinine ratio dipsticks (Clinitek® Microalbumin) read on the Clinitek® 50 urine chemistry analyser.     Creatinine is not protein-bound and is freely filtered by glomeruli. Endocrine Unit. To optimize accurate staging of CKD, serum creatinine concentrations should be evaluated on two or more occasions when the patient is well-hydrated. 0 doc said its possible kidney failure however this is her first bad lab work. Creatinine has been found to be a fairly reliable indicator of kidney function. My doctor said that after blood test I need to get abdominal scan. 7mmol/L Normal Creatinine – 62-106umol/L -> 0. Normal creatinine range is:. This article will introduce to you normal creatinine range. 1 mg/dl in women. 91 mL/min/1. The normal value for eGFR is 90-120 ml/min. As the kidneys become impaired for any reason, the creatinine level in the blood will rise due to poor clearance of creatinine by the kidneys. A GFR number of 60 or higher is still considered to be within the normal range. Creatinine Classification. Normal blood creatinine levels are: Men: 0. A 24 hour urine protein determination remains the recommended true measure of proteinuria. Diabetes patients must control their blood sugar within the normal range to ensure normal kidney function. Healthy kidneys take creatinine out of the blood and remove it into the urine to leave the body. Another factor that can affect BUN results is your protein intake. The study, published online in JAMA. However, some patients may have similar or higher creatinine results by the new method. Because of the wide range of normal for serum creatinine in most clinical laboratories, GFR must decline to approximately half the normal level before the serum creatinine concentration rises above the upper limit of normal.