In the Minimal Supersymmetric Standard Model, the effective b quark Yukawa
coupling to the lightest neutral Higgs boson is enhanced. Therefore, the
associated production of the lightest Higgs boson with a b quark is an
important discovery channel. We consider the SUSY QCD contributions from
squarks and gluinos and discuss the decoupling properties of these effects. A
comparision of our exact Order(alpha_s) results with those of a widely used
effective Lagrangian approach, the Delta_b approximation, is also presented.