GGT Blood Test

GGT blood test is conducted to detect liver dysfunctioning. The test is conducted with ALP. In liver diseases both ALP and GGT are elevated. During bone diseases only the level of ALP is elevated. GGT is also useful in diagnosing alcohol abuse. It is useful in finding out the disease but the test is unable to distinguish between different causes. GGT is useful in checking whether the alcoholic abuse is following the treatment program or not.


  • liver injury
  • Vomiting
  • Abdominal swelling
  • Pruritus
  • Tiredness
  • Abdominal pain


The doctor is not concerned with the test result in terms of level as it does not matter the level is low or high. High level of the test results will only help the doctor know that something is wrong with the liver. Higher the results greater is the damage to the liver. It will help doctor know whether the patient has liver disease or not. Other reasons for high level of the test results are congestive heart failure, drinking alcohol, antibiotics, anti fungal agents, antidepressant and some hormones like testosterone.

Precautions Before the Test

  • Alcohol can show variations in the test results. If the person consumes alcohol within 24 hours of the test, the results may show variations.
  • Meals can show variations in the test results. It is suggested to avoid food at least 8 hours before the GGT blood test.
  • Avoid smoking before the test.
  • Age is an responsible factor during the test specially in women.
  • Some drugs can induce the level of GGT.

When is the Level of GGT Increased

  • Acute hepatitis can show high level of GGT.
  • Many drugs and toxins elevate the level of GGT.
  • Alcohol is potent inducer of GGT.
  • Medicines like Phenobarbital, Steroid, Dilantin, etc.
  • Cimetidine therapy increases the level of GGT.

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