its recommended. but most people don't do it. it would be a good thing to do because you can feel recovered without being totally there and really have no idea whats going on at the organ level or even cell level of your body.
its a personal decision that we all have to make but it would be smartest to do bloods. (though I haven't and probably won't)
that being said, IMO a lot of ph/ds cycles won't be as harsh as running other was cycles due to length. i would follow the recommended time on + post cycle therapy (pct) = time off as a general guideline - but you can recover faster or slower, its all up to your post cycle therapy (pct) and your body.
fyi theres a sticky in the AAS forum for getting bloodwork done cheap.