Progesterone Free & Total – Ref Lab See reference lab website for details. https://www.labcorp.com/tests/503658/progesterone-free-with-total-progesterone-lc-ms-ms-endocrine-sciences Overview Specimen Performance Codes Aliases503658,PN0012584 Specimen TypeSee reference lab website for details. https://www.labcorp.com/tests/503658/progesterone-free-with-total-progesterone-lc-ms-ms-endocrine-sciences