The type of hemoglobin that has least affinity for 2,3-Diphosphoglycerate (2,3-DPG) or (2,3-BPG) is:
Foetal hemoglobin does not bind 2,3-DPG. Ref: Four Hidden Metamorphoses: A Remark on Blood, Muscle, Mental Diseases and Cancer By Maurice Israel, 2004, Page 9
HbA
HbF
HB
HgA2