NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.

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ARUP. Progesterone [3 paragraphs]. ARUP's Guide to Clinical Laboratory Testing (CLT) [On-line information]. Available FTP: http://www.aruplab.com/guides/clt/tests/clt_148b.htm

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Spengler, R. (2000 October 30, updated). Progesterone [19 paragraphs]. WebMD [on-line information]. Available FTP: http://my.webmd.com/encyclopedia/article/1689.52570

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NCI (2002 July 16). Questions and Answers: Use of Hormones After Menopause [38 paragraphs]. National Cancer Institute, News from the NCI [On-line press release]. Available FTP: http://newscenter.cancer.gov/pressreleases/estrogenplus.html

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Merck. Hormones and Reproduction [13 paragraphs]. The Merck Manual of Medical Information – Home Edition [On-line information]. Available FTP: http://www.merck.com/pubs/mmanual_home/sec22/232.htm