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Ammoniafldscnc

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of ammonia in your blood to evaluate liver function and detect certain metabolic disorders.

Quick summary

{"Measures ammonia levels in blood serum","Helps evaluate liver function and detect liver disease","Used to diagnose conditions like hepatic encephalopathy","Requires fasting before the test","Abnormal results may indicate liver problems or metabolic disorders"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
15149-8
Short code
Ammonia Fld-sCnc
Synonyms
Ammonia Fld-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
— – 200 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

The ammonia test is a blood test that measures the level of ammonia (a waste product) in your blood. Ammonia is produced when proteins are broken down in your body. Normally, your liver converts ammonia into urea, which is then filtered out by your kidneys and excreted in urine. This test helps healthcare providers assess how well your liver is functioning and whether ammonia is building up in your blood.

During the test, a healthcare professional will draw a blood sample from a vein in your arm. The sample is then sent to a laboratory for analysis. It is important to follow any pre-test instructions, such as fasting for 8-12 hours before the blood draw, as food intake can affect ammonia levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings2

Frequently asked questions

Why do I need an ammonia test?
Your doctor may order an ammonia test if you have symptoms of liver disease, such as yellowing of the skin or eyes (jaundice), abdominal swelling, or unexplained confusion. It is also used to monitor known liver conditions and evaluate the severity of liver disease.
Do I need to prepare for the test?
Yes, you will typically need to fast for 8-12 hours before the test. Avoid smoking before the test, as smoking can increase ammonia levels. Also, inform your doctor about any medications you are taking, as certain drugs can affect test results.
What do abnormal results mean?
Elevated ammonia levels may indicate liver disease, liver failure, or certain metabolic disorders. Low ammonia levels are less common and usually not a concern. Your doctor will interpret your results in the context of your overall health and other test results.
Is the test painful?
You may feel a brief sting or pinch when the needle is inserted to draw blood. The discomfort is usually minimal and lasts only a few seconds. Some people may experience bruising at the injection site, but this is typically temporary.
How long does it take to get results?
Results are usually available within a few hours to a day, depending on the laboratory. Your healthcare provider will discuss the results with you and explain what they mean for your health.
  1. 1
    MedlinePlus - Ammonia Blood TestSource
  2. 2
    Mayo Clinic - Ammonia TestSource
  3. 3
    ARUP Consult - AmmoniaSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy