Chadwick's sign is a bluish discoloration of the cervix, vagina, and labia resulting from increased blood flow. It can be observed as early as 6 to 8 weeks after conception, and its presence is an early sign of pregnancy.
These color changes were discovered in approximately 1836 by French doctor Étienne Joseph Jacquemin (1796-1872), and are named after James Read Chadwick, who drew attention to it in a paper read before the American Gynecological Society in 1886 and published in the following year, wherein he credited Jacquemin for their discovery.
- Note: In some it can be seen earlier. pregnancytoday.com Archived July 22, 2009, at the Wayback Machine.
- Gleichert, James E. (1971). "Étienne Joseph Jacquemin, Discoverer of 'Chadwick's Sign'". Journal of the History of Medicine and Allied Sciences. 26 (1): 75–80. PMID 4925842. doi:10.1093/jhmas/XXVI.1.75.
- Chadwick, James Reed (1887). "The value of the bluish discoloration of the vaginal entrance as a sign of pregnancy". Transactions of the American Gynecological Society (11): 399–418.
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