My sgpt level is 66 , is it dangerous?

Mild: Sgpt or serum glutamic-pyruvic transaminase also known as alt is one of your liver enzymes that is commonly measured on standard labs. Upper limit of normal on most labs is aroung 40 so 66 is a mild elevation that can be due to multiple things: virus, medications, alcohol, even vigorous activity. I would not get to worried about this, but probably worth getting repeat labs in 6 months or so.

No: Your sgpt, also called alt, is slightly elevated and by itself not dangerous. Do you drink? How much? Have you been tested for hepatitis? It would be prudent to discuss it with your doctor at your next visit. In the meantime, refrain from alcohol and tylenol (acetaminophen).