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Fig. 1 | BMC Pregnancy and Childbirth

Fig. 1

From: Association between lower uterine wall thickness measured at 18–22 weeks of gestation and risk of Preterm Birth: a prospective cohort study

Fig. 1

The measurement of the LUW thickness. a An ultrasound transducer was placed in sagittal plane just above the pubic symphysis to visualize the urinary bladder, cervix with visible cervical canal, and LUW. b The picture was enlarged until LUW and the urinary bladder occupied the majority of the screen. c A virtual red dashed line was drawn in horizontal plane between the dome of urinary bladder and LUW to mark a point for measurement. The yellow line represented the peritoneum that covered the LUW. The calipers were placed in inner-to-inner fashion to measure the LUW thickness

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