First of all there are many causes of elevated liver enzymes
. I suppose you were tested for one of the most common ones which are the viral hepatitis
(HEpatitis B and hepatitis C).
The fact that you had Hashimoto's thyroiditis, which is an autoimmune disease
(where your body attacks itself), is a risk factor for having concurrent Autoimmune Hepatitis
. This can be tested by blood tests (ANA, AMA, ASMA, etc), but may require a liver biopsy
. OTher causes to consider: alcohol intake, iron overload, medication induced hepatitis, fatty liver (common in diabetics, overweight people). If no answer is obtained with labwork and ultrasound of the liver then I would recommend you going for the liver biopsy.