In england the rh test is done after the birth of the baby because it is if the mother is rh negitive and the baby rh positive that they need the injection.

 It´s the same in Ireland, but actually you get your blood tested at your first hospital/doctor appointment, so the hospital/doctor know in case you get a bleed during your pregnancy, if your rh negative you have to get the anti-d injection then just in case.  And if your child is born rh positive you have to get the anti-d injection, not the baby, the anti-d injection stops your blood/body attacking any other rh positive babies that you may concieve in the future after giving birth to a rh positive baby.  I´m rh negative negative and all my children are rh positive and I´ve had more anti-d injections than I care to remember!!! haha.... there horrible