Sensitive immunoradiometric assay (IRMA) for serum thyrotropin may be insufficient to make the thyrotropin-releasing-factor test unnecessary.
D006801:Humans; D011863:Radioimmunoassay; D013972:Thyrotropin / Q000097:blood*; D013973:Thyrotropin-Releasing Hormone / Q000097:blood
D013973:Thyrotropin-Releasing Hormone; D013972:Thyrotropin