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What is this test?

The ammonium urate crystals test is a microscopic examination of your urine sediment. A small sample of urine is spun in a centrifuge to separate the solid particles (sediment) from the liquid. This sediment is then examined under a high-power microscope to look for ammonium urate crystals. These crystals appear as yellow-brown to dark brown spherical structures with spiky or ridged surfaces, sometimes called "thorn apple" crystals. The lab technician counts how many of these crystals are seen in each field of view.

Why do I need this test?

Your doctor may order this test if you have symptoms of a urinary tract problem, such as pain during urination, frequent urination, or blood in the urine. It may also be ordered if you have symptoms of liver disease, such as jaundice (yellowing of skin or eyes), abdominal pain, or unexplained fatigue. The test helps doctors determine if certain crystals in your urine are contributing to kidney stones or other urinary problems. It may also be part of a routine urinalysis or a workup for unexplained symptoms.

How should I prepare?

For this test, you will need to provide a clean urine sample. Your doctor may ask you to stop taking certain medications or supplements before the test, as some substances can affect crystal formation. Stay well-hydrated unless your doctor instructs otherwise. Inform your healthcare provider about all medications, vitamins, and supplements you are taking. If you have menstrual bleeding, tell your doctor, as blood in the urine can affect the test results.

What happens during the test?

You will be given a sterile container to collect a mid-stream urine sample. This means you should start urinating into the toilet, then collect the middle portion of your urine stream into the container, and finish urinating into the toilet. The sample should be delivered to the lab quickly, as crystals can form in standing urine over time, which might affect the accuracy of the results. The actual laboratory analysis involves centrifuging the sample and examining it under a microscope.

Are there any risks?

This test involves only a standard urine collection, which is generally safe and has no significant risks. You may experience mild discomfort when providing a urine sample if you have a urinary tract infection. There is no risk of infection from the test itself since the sample is only collected and analyzed.