False HbA _1c value due to a rare variant of hemoglobin Petie Salpetriere coinherited with alpha thalassemia

This is the first reported case involving the Hb Petie Salpetriere variant in a Spanish patient. The present results show that the Hb Petie Salpetriere variant can affect the results of HbA_1c analysis through ion-exchange HPLC, but not that obtained from the latex agglutination immunoassay. Only ion-exchange HPLC suggested the presence of the Hb variant in this case, suggesting that a careful review of the resulting chromatogram might reveal a potential variant.