The ALT can be elevated in a variety of liver diseases.
I would obtain blood tests to exclude hepatitis. I also agree with the ultrasound to evaluate for anatomic liver diseases or masses.
The alkaline phosphatase can be elevated can also be elevated in gallbladder or liver disease. If the ultrasound is negative, I would pursue a CT scan as the next step.
The definitive test would be a liver biopsy, and can be considered if the tests remain negative.
These options can be discussed with your personal physician.
This answer is not intended as and does not substitute for medical advice - the information presented is for patients education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
www.kevinmd.com