Most initial testosterone testing starts with total testosterone. In some situations, however, other information may help a clinician interpret the result.
For example, testosterone circulates in both bound and unbound forms. SHBG is one of the proteins that binds testosterone, and testing it can sometimes help clarify how much testosterone is available to tissues when the clinical picture and total testosterone do not match clearly.
That does not mean every man needs total testosterone, free testosterone, SHBG, LH, FSH, prolactin, estradiol, cortisol and a large “male hormone panel.”
Testing should still follow the medical question.
Read: Do You Really Need a Full Hormone Panel?