A member asked:

Results from gp stating my liver fiction test was borderline and need to be retested. i'm concern as i have a marathon on 1 month.

A doctor has provided 1 answer

About liver tests: Liver function tests measure enzymes found in liver cells, but also elsewhere, eg. muscle cells. Levels rise in the blood when cells are injured.Too much acetaminophen (paracetamol) & alcohol damage to the liver are common reasons, but they can be high in marathon runners & weight lifters from stress on muscles, or w/o identified reason. Best to avoid vigorous exercise the day before a blood test.

Answered 3/26/2015

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