I got a tattoo. on 32nd day i went for hiv 1/2 & p24 combo test (cmia) and its came negative. is this conclusively? how much i can trust this result.

Trust it: Proper sterilization of tattoo equipment is near-universal today. There is an HIV risk if the needle was recently used by another person. Just how much of a risk getting inked ever was for hepatitis C is unknown; other risky practices run with tattoo culture. Whatever exposure you may have had, the test is reliable at 32 days; human reporting error makes the false-negative rate unknowable.