CERVICAL WIDTH  

Measurements of cervical width are made at the angle between the uterine cervix and body, at the point of greatest AP diameter on longitudinal scans.
 

 

Mean cervical width

Ref.

 

Normal Pregnancy
 
Cervical Incompetence

16 mm ± 3 mm (11-18 weeks of gestation)
 
26 mm ± 4 mm
³20 mm (in second trimester)

(1,2)
 
(1,2)
(3)

 

 

REFERENCES
  1. Brook I, Feingold M, Schwartz A. Ultrasonography in the diagnosis of cervical incompetency in pregnancy: a new diagnostic approach. Br J Obste Gynecol 1981;88:640-643.
  2. Feingold M, Brook I, Zakut H. Detection of cervical incompetence by ultrasound. Acta Obstet Gynecol Scand 1984;63:407-440.
  3. Mahran M. The role of ultrasound in the diagnosis and management of the incompetent cervix. In: Kurjak A, (ed). Recent advances in ultrasound diagnosis. 2nd ed. Oxford: Excerpta Medica 1980:505-514.