Ammoniaplasscnc

What is this test?

The ammonia blood test measures the amount of ammonia (NH3) in your plasma. Ammonia is a waste product produced when your body breaks down proteins. Normally, your liver converts ammonia into urea, which is then excreted by your kidneys. This test helps healthcare providers assess how well your liver is functioning and check for conditions that cause abnormal ammonia buildup.

Why is this test performed?

Your doctor may order an ammonia test if you have symptoms of liver disease such as jaundice (yellowing of skin or eyes), confusion, extreme tiredness, or swelling in the abdomen. It is also used to monitor patients with known liver disease, evaluate unexplained coma, and diagnose certain inherited metabolic disorders like urea cycle defects.

How to prepare for the test

Follow these important preparation steps: Fast (do not eat) for 8-12 hours before the test as instructed by your doctor. Avoid smoking before and during the test, as smoking significantly increases ammonia levels. Do not chew gum before the test. Inform your doctor about all medications you are taking, as some medications can affect test results. Rest and avoid strenuous exercise before the test, as physical activity can temporarily increase ammonia levels.

What happens during the test?

A healthcare professional will draw a blood sample from a vein in your arm using a small needle. You may feel a brief sting or pinch. The blood will be collected in a tube and sent to a laboratory for analysis. The collection process only takes a few minutes.

Understanding your results

Normal ammonia levels vary slightly by laboratory but are typically between 15-45 μmol/L (micromoles per liter). Your doctor will interpret your results based on your overall health and other test results. Elevated ammonia levels (hyperammonemia) can indicate liver disease, liver failure, hepatitis, cirrhosis, or certain metabolic disorders. Low levels are less common but may occur with certain genetic conditions or use of some medications.