Anti-PP1P k alloantibody, is produced in the serum of individuals with the rare p phenotype. It is associated with severe haemolytic transfusion reactions, recurrent spontaneous early abortions as well as haemolytic disease of the foetus and newborn. Anti-PP1P k alloimmunization in pregnancy differ from others in their physiopathology. It seems that the placenta would be the main target of anti-PP1P k antibody.

This report concerns a 35 year old female, with a history of a high incidence (12) of early and recurrent miscarriages. She was found to have the extremely rare p phenotype and anti-PP1P k antibody in her serum. Her 13th pregnancy was successfully managed by plasmapheresis. No substitution fluid was added. Oral hydration was recommended before and after the apheresis sessions. 12 plasmapheresis cycles were performed before a healthy term female infant weighing 3kg600g, was delivered by caesarean section at 38 weeks of gestation.

Plasmapheresis seems to be the treatment of choice in the management of anti-PP1P k fetomaternal incompatibilities. However in this case, we opted for an original and less expensive protocol. We did resort, neither to substitution fluid nor to intravenous immunoglobulin.