My sister got these liver function results: ggt - 72 iu/l alt - 344 iu/l ast - 263 iu/l got a referral to a physician. are these results very worrying?

Depends: The liver enzymes are not too high, however, it is important to ascertain the cause of elevation. It may be as simple as a simple short liver viral infection, however, it is important to see your doctor for an evaluation. Have a healthy diet, exercise, drink plenty of water, have safe sex, and get HPV vaccine. Wish you good health! Nutrition: http://www.choosemyplate.gov/.