Abbott Labs has a one-step immunoassay test (TestPack Plus) for urinary beta hCG, which it describes as using a colloidal selenium particle labeled with monoclonal anti-alpha-hCG. Isn't the alpha subunit shared by LH, FSH and TSH? I thought the beta subunit was the distinguishing moiety among these. Bill Koslosky - koslosky at ix.netcom.com