Matching blood type for thalassemia patients is not just choosing from the known ABO groups. There are sub-classifications of R1, R2, R0, R1R2, among others, that most doctors will decline to explain such complexities and will refer you to specialist.
Hence, we simply need more donors in order to get the correct match, said Allan Zac Gerald, leader of Persatuan Pengerak Sabah, who coordinates a blood donation campaign, here