Cervical incompetence is when the cervix measures less than: (A) 1 cm, (B) 1.5 cm, (C) 2 cm, (D) 2.5 cm
Answer is D. Cervical incompetence diagnosis : History of repeated midtrimester painless cervical dilatation with escape of liquor amnii followed by painless expulsion of products of conception Passage number 6-8 Hegor dilator beyond internal os without resistance Absence of opening snap on withdrawal of Hegar dilator Hysterography showing funnel shaped shadow During pregnancy ,sonography showing sho cervix <25 mm. Speculum examination showing dilatation of internal os with herniation of membranes. Ref: Dutta Obs 9e pg 161.