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They do a calculation based on body mass. It is a crude calculation, and I think that most of the time they err a little toward the higher side if the donor's marrow/stem cell collection affords it.
I have seen people receive 3 units of blood and 2 or 3 units of platelets depending on the circumstances.
The stem cell collection is an actual calculation, the PRBC and Platelets are probably an experience based thing, depending on the patient and the center.
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MDS RCMD w/grade 2-3 fibrosis. Allo-MUD Feb 26, 2014. Relapsed August 2014. Free and clear of MDS since November 2014 after treatment with Vidaza and Rituxan. Experiencing autoimmune attack on CNS thought to be GVHD, some gut, skin and ocular cGVHD. Neuropathy over 80% of body.
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