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Urine Creatinine - Spot Collection - Creatinine-Urine


Overview & Description

This test measures the amount of creatinine in the urine. Creatinine is produced in the muscles and filtered by the kidneys. The amount of creatinine in the urine is a measure of how well the kidneys are functioning.

Who is a candidate for the test?

This test may be ordered to check a person's intake of fluid or of high protein foods such as meat. It also detects muscle damage or degeneration, nerve damage from diabetes mellitus, or other disorders of the endocrine system. It provides clues about damage or blockages within the kidney, bladder or other parts of the urinary system.

How is the test performed?

Either a 24-hour urine sample or a spot sample may be done.

For a spot sample, the person urinates and collects a small sample in a container. The container is sealed and given to the healthcare provider.

For a 24-hour urine sample, the person should follow the specific instructions of the healthcare provider. In general, this schedule is followed:

  • Day 1: The person urinates upon arising without collecting that sample. After that, he or she collects all of his or her urine for the next 24 hours in a special container.
  • Day 2: First thing in the morning, the person urinates into the container again. Then the individual covers it and refrigerates it. The sample is brought to the doctor, who will send it to the lab for analysis.

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