These color changes were discovered in approximately 1836 by Frenchdoctor 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.
^ abGleichert, James E. (1971). "Étienne Joseph Jacquemin, Discoverer of 'Chadwick's Sign'". Journal of the History of Medicine and Allied Sciences26 (1): 75–80. doi:10.1093/jhmas/XXVI.1.75. PMID4925842.
^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.