Hi Alison,
Your father and I were both dx May 2006 with MDS and have been transfusion dependent from start. I always get 2 units when I get RBC:s but I think 3 and even 4 could be OK. Here is a link about transfusions:
http://www.cancerbackup.org.uk/Treat...odtransfusions
Kind regards
Birgitta-A
69 yo, MDS Interm-1 dx May 2006, transfusion dependent, Desferal four days with transfusion, Neupogen 2 injection/week, waiting for Eltrombopag for my platelets (now 42)