Ammoniaplasmscnc

What is this test?

The Blood Ammonia Test measures the amount of ammonia in your plasma (the liquid part of your blood). Ammonia is a natural waste product created when your body breaks down proteins. Normally, your liver converts ammonia into urea, which your kidneys then excrete through urine. This test helps doctors evaluate how well your liver and kidneys are functioning.

Why do I need this test?

Your doctor may order this test if you have symptoms of liver disease, such as jaundice (yellowing of skin or eyes), confusion, drowsiness, or unusual body odor. It is also used to monitor conditions like hepatic encephalopathy (a brain disorder caused by liver disease), cirrhosis, hepatitis, or Reye's syndrome. Additionally, the test can help evaluate inherited metabolic disorders that affect how your body processes ammonia.

How is the test performed?

A healthcare professional will draw a blood sample from a vein in your arm using a small needle. The blood is collected into a special tube containing an anticoagulant to prevent clotting. The sample must be placed on ice immediately and processed quickly, as ammonia levels can change after the blood is drawn. The entire process only takes a few minutes.

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. Do not smoke for at least 8 hours before the test, as smoking increases ammonia levels. Avoid strenuous exercise before the test. Inform your doctor about all medications you are taking, as certain drugs can affect ammonia levels. Follow any specific instructions provided by your healthcare team.

Understanding your results

Normal ammonia levels vary slightly by laboratory but are typically between 15-45 micromoles per liter (μmol/L). High levels (hyperammonemia) may indicate liver failure, cirrhosis, hepatitis, kidney failure, certain metabolic disorders, or severe infection. Very high levels can be dangerous and require immediate medical treatment. Your doctor will interpret your results based on your overall health, symptoms, and other test findings.