Fig. 2From: Transperineal ultrasound of fetal head progression in prolonged labor: women’s acceptance and ability to predict the mode of deliveryTPUS showing a FHPD of 3.1 cm. The probe was put longitudinally on the perineum; the probe was manipulated to obtain the shortest distance. The soft tissue was compressed firmly but gently without causing pain. The shortest distance from the perineal skin surface to the most distal outer bony surface of the fetal skull is measuredBack to article page