• On day 1, urinate into the toilet when you get up in the morning.
• Afterwards, collect all urine in a special container for the next 24 hours.
• On day 2, urinate into the container when you get up in the morning.
• Cap the container. Keep it in the refrigerator or a cool place during the collection period. Label the container with your name, the date, the time of completion, and return it as instructed.

Infant:
Thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on the infant. For males, the entire penis can be placed in the bag and the adhesive attached to the skin. For females, the bag is placed over the labia. Diaper as usual over the secured bag.

This procedure may take a couple of attempts -- lively infants can displace the bag, causing the specimen to be absorbed by the diaper. The infant should be checked frequently and the bag changed after the infant has urinated into the bag. The urine is drained into the container for transport to the laboratory.

Deliver it to the laboratory or your health care provider as soon as possible upon completion.

The most common reason for measuring uric acid levels is for evaluation, diagnosis, and treatment of kidney stones. Patients with gout may also be evaluated using this test, since a significant number of patients with gout develop uric acid kidney stones.

Uric acid is the end-product of purine catabolism. Purines (such as adenine and guanine) are components of nucleotides, which are the building blocks of the nucleic acids such as RNA and DNA.

Abnormal results are indicated as follows:

Greater-than-normal urinary uric acid levels may indicate:

• Metastatic cancers
• Myelogenous and lymphoproliferative disorders
• High purine diet
• Gout
• Rhabdomyolysis
• Lesch-Nyhan syndrome
• Fanconi syndrome

Lower-than-normal urinary uric acid levels may indicate:

• Chronic alcohol ingestion
• Chronic glomerulonephritis
• Lead poisoning

• High levels of vitamin C
• X-ray contrast agents