In routine cases of XY DSD, a persistently low AMH may have a high predictive value for a low hCG-stimulated testosterone concentration but a normal AMH has a low predictive value for a normal hCG-stimulated testosterone value.35 These relationships between the two variables do not apply to cases of persistent Müllerian duct syndrome where there is an intrinsic defect of AMH or the AMH receptor. This evidence concerns the gene AMH and persistent Mullerian duct syndrome.