What is the normal range for liver enzymes like ALT and AST?
Normal range of ALT and AST are below 40 U/L although the limits depending on the laboratory are variable. Always relate your achievements to the so-called specific values of reference of the testing lab.
What is the ICD-10 code for abnormal liver function studies?
The code under the ICD-10 that represents the results of tests that the abnormal liver functions include the code R94.5 that can be applied in insurance and in the medical records.
Can abnormal liver function test results be reversed?
Yes, that there are a lot of cases which can be improved or even normalized after making lifestyle changes, including healthy nutrition, physical activities, decreasing alcohol consumption, and proper medical practice.
Do I need to fast before having liver function tests?
Liver blood work tests generally do not need fasting, though, your doctor will assign specific rules or may require a laboratory to do so.
How often should I have my liver function tests checked?
The number of tests depends on your risk factors and your health state. There are patients who undergo optimal tests 3-6 months every year and others might even get an annual check.
Can common pain medications affect liver function tests?
Yes, medications such as acetaminophen (Tylenol) and some herbal supplements may cause liver enzyme levels to rise, and to be aware of all your medicaments and supplements, you should tell your physician about them.
When should I consult a liver specialist?
Refer to a gastroenterologist or a hepatologist in case your LFTs involve persistence, or in case of the emergence of such symptoms as jaundice, unexplainable fatigue or abdominal pain.
Are there natural ways to support my liver function?
The steps that can help you take care of your liver are having a balanced diet that is full of fruits, vegetables, and whole grains, workout, proper hydration, and low or no alcohol intake.
Is imaging necessary for abnormal liver tests?
Often, yes. True conditions of fatty liver, tumors, or bile duct obstructions can be identified by such techniques as abdominal ultrasound, CT scan, or MRI which may cause abnormal LFTs.
Can abnormal liver function tests indicate liver cancer?
LFTs are not diagnostic of cancer, however if the results remain abnormal repeatedly this may lead to investigations that may identify tumors or other severe conditions of the liver.
Medically Reviewed by
Dr. Bharat Pothuri, MD, FACG
| Updated 03-17-2026