is an indication of pregnancy
in a woman, specifically the compressibility and softening of the cervical isthmus
(the portion of the cervix between the uterus
and the vaginal portion of the cervix
) and the uterine cervix
appearing bluish and engorged.
The sign is usually present during second and third months of pregnancy from the fourth to sixth week. It is not a positive indicator of pregnancy, and its absence does not exclude pregnancy.
The indicator was originally described by Ernst Ludwig Alfred Hegar, a German gynecologist, in 1895. Hegar credits one of his students for discovering the sign.
References and further reading:
- E. Sonntag Das Hegar'sche Schwangerschaftzeichen Leipzig, 1892. Ca. 20 pp. Sammlung Klinischer Vorträge herausgegeben, Leipzig, Neue Folge no. 58.
- A. Hegar Diagnose der frühesten Schwangerschaftsperiode Deutsche Medizinische Wochenschrift, Berlin, 1895, 21 (35): 565-567.