If your creatinine is really high and is caused by an acute or chronic kidney injury, the amount will not decrease until the main problem is resolved. If it was briefly or wrongly elevated due to dehydration, a very high protein diet, or the use of supplements, then the amount will be reduced by removing such factors. A person receiving dialysis, after treatment, will also have lower levels.
Having low creatinine levels is rare, but this can happen as a result of certain conditions that cause reduced muscle mass. Normally, they are no cause for concern.
When should it be repeated?
After a few weeks, your doctor may want to repeat the serum creatinine test to see if the results are similar. If you have diabetes type 1 or type 2, your doctor may prescribe creatinine testing at least once a year.
If you suffer from renal disease, your doctor can recommend regular creatinine tests to monitor your condition.
A member of your health care team takes a blood sample during the serum creatinine test by sticking a needle into a vein in your arm. Then, the blood sample will be sent to a laboratory for analysis. Once the test is done, you can immediately get back to your usual routine.
Your doctor may also in some cases measure the level of creatinine in your urine. For this test, which is a part of a creatinine clearance test, your doctor may ask you to collect urine samples for 24 hours in an exclusive container. The urinary creatinine test will help the doctor assess the existence or degree of kidney failure more accurately.
Learn more about diagnosing and managing kidney disease here.
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