<prompt> A G1O attends the antenatal clinic for the booking visit at 12 weeks. Her blood group is B Rhesus negative.What is the next step in the management?Determine the fetal blood groupDetermine the husbands blood groupPerform an ultrasound scanPerform Rhesus antibody titer  <response>: Ans. is b, i.e. Determine the husbands blood groupWhen a rhesus negative primipara attends the antenatal clinic, the first step is to determine her husbands blood group. If the husband is Rhesus negative no further investigations are necessary, as all babies will be Rhesus negative. 