What does a creatinine level test involve? Sometimes creatinine levels are tested over a hour period. The lab will test the amount of creatinine in your urine, and then compare that to the amount of creatinine in your blood. This shows your doctor how much waste is being filtered out of your body—and how your kidneys are performing.
Sometimes your care team needs answers faster. Creatinine and GFR. One important calculation your doctor will perform is to determine your estimated glomerular filtration rate eGFR. Your glomerular filtration rate is a measurement of how well your kidneys are working to clean your blood. Your doctor will calculate your eGFR using your serum creatinine blood test results and factoring in your age, weight, body size, ethnicity and gender.
You can use our on line GFR calculator to calculate your eGFR, once you have the serum creatinine blood test results from your doctor. Your doctor may want to compare your creatinine levels over time because there are many factors that can affect results in the short term. A long-term view of creatinine levels can offer a more accurate measurement of overall kidney function. What are the symptoms of high creatinine levels? What can I do about high creatinine?
Once they find a vein, they insert a needle into it to collect the blood. In most cases, a vein on the inside of the elbow is used. After the healthcare provider removes the needle, they put a bandage over the puncture wound. Once enough blood is drawn, the sample is sent to a laboratory for analysis. Your doctor will give you the results within a few days of testing. People who are more muscular tend to have higher creatinine levels.
Results may also vary depending on age and gender. In general, however, normal creatinine levels range from 0. Normal levels are roughly the same for people over If it was temporarily or falsely elevated due to dehydration, a very high-protein diet, or supplement usage, then reversal of those conditions will lower the level. Also, a person receiving dialysis will have lower levels after a treatment. You should always meet with your doctor to discuss your test results in more detail.
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Severe dehydration is a risk factor for kidney injury, which will affect creatinine levels. What a person eats can have a significant impact on creatinine levels. For example, proteins and cooked meat contain creatinine, so eating more than the recommended amount of meat or other proteins for your activity levels, or adding extra protein to the diet through supplements can cause high creatinine levels. Creatine is present in the muscles and helps them produce energy.
Rigorous exercise can increase creatinine levels by increasing muscle breakdown. Antibiotics , such as trimethoprim, and H2 blockers, such as cimetidine, can cause a temporary increase in measured serum creatinine levels. Because the breakdown of muscle produces creatinine, low muscle mass can result in low levels of creatinine. Older people are more at risk as muscle mass declines with age. Malnutrition can also cause low muscle mass and low creatinine levels.
Chronic conditions, such as myasthenia gravis or muscular dystrophy , may result in low creatinine levels. Pregnancy causes an increase in blood flow to the kidney leading to increased urine production and faster elimination of creatinine, leading to lower levels.
Dietary choices and physical activity play an essential role in regulating blood creatinine levels. It is advisable to keep protein consumption within the recommended range for age and activity level. Talk to a doctor about the treatment options, especially if the level of creatinine in the blood is high. If it persists at a high level, people may need to see a kidney specialist.
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