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A standard blood test is used to measure creatinine levels in your blood (serum creatinine). Your doctor may ask you not to eat (fast) overnight before the test. For a creatinine urine test, you may need to collect urine over 24 hours in containers provided by the clinic.
In general, around 6 to 24 mg/dL (2.1 to 8.5 mmol/L) is considered normal. But normal ranges may vary, depending on the reference range used by the lab and your age. Ask your doctor to explain your results.
Kidney function tests look for the level of waste products, such as creatinine and urea, in your blood. Urine tests. Analyzing a sample of your urine can reveal abnormalities that point to chronic kidney failure and help identify the cause of chronic kidney disease.
Creatinine is a byproduct of normal muscle function. It is a metabolite of creatine phosphate, which the muscles use as an energy source. The greater someone’s muscle mass, the higher their creatinine levels. For this reason, males tend to have higher creatinine levels than females.
Creatine is a compound that comes from three amino acids. Creatine is found mostly in your body's muscles as well as in the brain. Most people get creatine through seafood and red meat — though at levels far below those found in synthetically made creatine supplements.
A high level of creatinine can be an indication that something is wrong. If your kidneys aren’t working properly, the level of creatinine in your blood can build up. This can lead to uremia, a life-threatening disorder.
Liver function tests check the levels of certain enzymes and proteins in your blood. Levels that are higher or lower than usual can mean liver problems. The pattern and degree of elevation of these tests along with the overall clinical picture can provide hints to the underlying cause of these problems. Some common liver function tests include:
Your doctor uses your estimated glomerular filtration rate (eGFR) to measure your level of kidney function. Your eGFR is calculated using your blood creatinine test results, sex, age and other factors.
C-reactive protein (CRP) is a protein made by the liver. The level of CRP increases when there's inflammation in the body. A simple blood test can check your C-reactive protein level. A high-sensitivity C-reactive protein (hs-CRP) test is more sensitive than a standard C-reactive protein test.
A normal blood sodium level is between 135 and 145 milliequivalents per liter (mEq/L). Hyponatremia occurs when the sodium in your blood falls below 135 mEq/L. Many possible conditions and lifestyle factors can lead to hyponatremia, including: