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1)it is possible but not compulsory. however small rise in values is not significant without any symptoms
2) your liver
Function status can be known by doing liver function tests albumin
and bleeding parameters.if there is any damage your enzymes will shoot up.
3) low platelet can be a sign of poor liver function. However as your SGPT is near normal you do not have worry. Please repeat the test after a week or two.
Hope I answered your question.If you need more information feel free to mail me.