My testosterone, thyriod, dhea-s, 17- ohp, cortisol, prolactin & bp are normal level. but my androstenedione is very high. what could this indicate?

Hard to tell: One would expect the T levels to be elevated as well. I am not sure what very high means. Sometimes in polycystic ovarian syndrome androstenedione is elevated. The fact that DHEAS, T are normal is reassuring. I would suggest talking with your ordering physician about this so that they can determine how significant this result really is.