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If so, its one of the enzymes measured when undergoing a "Liver Function Test."
I'm not sure what units you are using, (?i.u/L) but if your levels are raised, it does need some investigating, although if the other levels are stable, your quack (sorry, Doctor), should be able to rule out most serious causes in his consulting room, and by sending you for more blood tests.
Isolated raised GGT can be a sign of prolonged excess alcohol intake, but this isn't always the case.
Isolated GGT levels without any other abnormalities are due to alcohol almost all the time. Gallstones in the common bile duct are almost always quite symtomatic and associated with other blood test abnormalities.
I had raised GGTs after my Doctor tested me once. I get checked becaus of the medication I take for high BP. However the test was unannounced and just after Valentines night dinner with my pregnant wife. Naturally I was forced to imbibe the entire contents of a bottle of wine all by myself No wonder it was high. He sent me a letter which just stopped short of suggesting the phone number of the nearest AA group. I went back later, properly fasted and without any wine in my system and passed easily.
So learned not to have any drink for a couple of days before a visit. Which isn't hard in my case because having a giggling one year old boy who sits on your head at 6 in the morning and pulls your hair, hangovers are to be avoided.
Any abnormal liver function tests - ask your doc to check for haemachromatosis please. Its a hereditary disease not often picked up until some level of damage has been sustained - totally unnecessary as its easily managed without medication.
I have a sibling who needed both hips replaced before the age of 40 and has chronic arthritis due to this condition being undiagnosed for far too long.
Medics assumed abnormal liver tests were due to excess alcohol consumption despite the fact that he's teetotal. (yes really)