My sgpt is 47but I don't any drugs nor drink alcohol. Should I be worried?

Liver. I would be worried. This is double normal and a sign of some inflammatory process. You have not included all of the common causes of liver strain, which include infection, being overweight, taking certain otc medications and toxic reactions to prescription medications.
Minimally up. This is worth following. Reference ranges are set so that several percent of healthy folks fall above the top.

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