Do i Have to claim my luggage again in Istanbul if I am transit and flying trhgouh Istanbul?

Yes when you go through customs in IST they'll have you grab your bags, bring them through with you and then take them again once you get through customs. It's not as bad as people think, i probably had mine for a total of twenty minutes before i checked it in again. The chances of you losing your bags again are slim to non. I've traveled internationally too many times to count this last year and i've lost mine a total of once. Good luck and there's nothing to be confused about they'll walk you through the system.