[Kelbell]

Just an FYI- normal bloodwork doesn't necessarily indicate OA, sometimes the opposite. Varicocoles, which are obstructive, are usually characterized by high FSH. I know, it doesn't make sense right?
My husband's blood work was "normal" (he had a normal/high FSH, but it was still in the normal range, which is very subjective depending on what doctor you talk to), and he has unexplained NOA.
But if they think its obstructive, grill the heck out of your UR to see if there could be any surgical intervention...it would be well worth it obviously. My uncle apparently had some sort of obstruction that they surgically corrected and he went on to have 3 kids with no problem.
The TESE or a testicular biopsy can be done with either NOA or OA that cannot be corrected. Even if he has OA that can't be corrected, I think you have a better chance of atleast getting better quality and more sperm than someone who has NOA, since with NOA there is usually some sort of production issue...
Be clear with your UR/RE that you would want to use recovered sperm for IUI if possible...that could change how they plan to collect it.
I am for you guys that it is an easily corrected obstruction!
And SFBay girl is right, the Azoo thread is fantastic for info, support, etc.