Probably to check out nothing else was going on, may have been a virus ..they are just being cautious I expect ..good luck
Are you overweight, drink alcohol, Certain prescription and over-the-counter medications can be the cause,
Try milk thistle, Also try liver detoxification
It's important to speak with a doctor first about treatment for elevated liver enzymes I suggest seeing a hepatologist doctor
I ditto the recommendation to go see a hepatologist. There are some diseases that "silently" affect the liver, including less commonly know tick borne diseases like HME (erlichiosis) and Bartonella (b.henselae).