Typically, the goal of being on ADT (Zoladex, Lupron, Eligard, etc.) is to get testosterone levels below 50 ng/dL, and PSA to undetectable. (My Testosterone level dropped to 3.0 ng/dL, and my PSA dropped to < 0.008 ng/mL at one point while on Eligard.)

The fact that your husband is on docetaxel (chemotherapy) means that his situation is not “typical.” So, his goal PSA is whatever his medical team determines it should be for his specific diagnosis. (What is his Testosterone level?)