A young pregnant lady is registered in ante-natal clinic and found to be having blood group B Rh D positive. In previous pregnancy she was grouped as BRhD negative and has documenting evidence of her blood group:
a. Laboratory error
b. Weak/Partial Rh D group
c. Rh null phenotype
d. Presence of anti-D in her serum
The discrepancy in blood group from a previous pregnancy could be due to a laboratory error. RhD typing errors are not uncommon, and verifying the blood group with repeat testing is a standard procedure. Weak/partial RhD, Rh null phenotype, or presence of anti-D in the serum are less likely explanations in this context.