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What is this test?

The Amino Acids Urea Cycle Panel is a blood test that measures the levels of specific amino acids involved in the urea cycle. The urea cycle is a process in your liver that converts harmful ammonia into urea, which is then excreted in urine. This test uses a sophisticated laboratory method called liquid chromatography-tandem mass spectrometry (LC/MS/MS) to accurately measure amino acid levels in your blood.

Why do I need this test?

Your doctor may order this test if you have symptoms of a urea cycle disorder, such as unusual sleepiness, vomiting, confusion, or developmental delays, especially in infants and children. It may also be used to monitor patients already diagnosed with urea cycle disorders or to evaluate family members of affected individuals.

How should I prepare?

You will typically need to fast (not eat or drink anything except water) for 8-12 hours before the blood draw. Your doctor will provide specific instructions. Certain medications may affect test results, so inform your healthcare provider about all medications and supplements you are taking.

What happens during the test?

A healthcare professional will draw a small blood sample from a vein in your arm. The blood will be collected in a tube and sent to a laboratory for analysis using LC/MS/MS technology. The test typically takes a few days to complete as special equipment is required.

Are there any risks?

The risks are minimal and include slight pain or bruising at the injection site, dizziness, or very rarely, infection. These blood draw risks are generally minor and resolve quickly.