Shape of cervical canal predicting preterm labour is: (DNB Dec 2009)
Diagnosis of preterm labour includes:
1. Regular uterine contractions with or without pain with a frequency of atleast one in every 10 minutes
2. Dilatation> 2 cm and effacement> 80% of cervix
3. Length of cervix on transvaginal ultrasound < 2.5 cm and funneling of internal os. (Funnel shape = Y shape)
4. Pelvic pressure, backache, vaginal discharge or bleed.