Bloody Minded Episode 44 - MAIPA Madness | FNAIT & Platelet Testing
Apr 29, 2025
Dive into the world of complex hematology with a lighthearted twist! Explore the quirky MAIPA test that combines four antibodies in one test, alongside amusing food analogies. Uncover the intricacies of fetal and neonatal alloimmune thrombocytopenia (FNAIT) and the clinical strategies for managing it. Get insights on the essential collaboration between hematology and neonatal teams, plus the challenges of treating immune thrombocytopenic purpura during pregnancy and optimizing transfusion protocols. It's educational and entertaining!
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Platelet Antigens Overview
- Platelets have many glycoproteins with multiple epitopes called human platelet antigens (HPA).
- There are 35 described HPAs, each residing on specific platelet glycoproteins like GP2B3A and GP1B5.
FNAIT Is Platelet HDFN
- Fetal and neonatal alloimmune thrombocytopenia (FNAIT) is like hemolytic disease of the fetus and newborn but targeting platelet antigens.
- Maternal antibodies against fetal platelets cause thrombocytopenia ranging from mild bleeding to severe intracranial hemorrhage.
Transfusion Strategy for FNAIT
- For suspected FNAIT neonates, transfuse platelets lacking maternal antibody-targeted HPA antigens.
- If matched platelets are unavailable, transfuse unmatched platelets to maintain platelet count and prevent bleeding.