Yes, my phlebotomy treatment threshold is also hematocrit > 52. Seems to be the standard. My hematocrit usually runs about 57.

My MD sent me an email just this morning. She said she is cautious and not permitting me phlebotomy with a hematocrit under 52 because frequent therapeutic phlebotomy can cause anemia.

Your numbers are in line with upper (but normal) male reference ranges. Here are my numbers with reference ranges listed:

WBC 7.7 K/uL male reference range = 3.7 - 11.1 K/uL
RBC 6.12 M/uL male reference range = 4.10 - 5.70 M/uL
Hgb 17.2 g/dL male reference range = 13.0 - 17.0 g/dL
Hematocrit 51.8 % male reference range = 39.0 - 51.0 %
MCV 85 fL male reference range = 80 - 100 fL
RDW, RBC 14.0 % male reference range = 12.0 - 16.5 %
Platelets 352 K/uL male reference range = 140 - 400 K/uL