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Crown-rump length was measured if the first visit was prior to 13 weeks of gestation.
If they presented after 13 weeks of gestation, biparietal diameter and femur length were measured to confirm gestational age.
However, if the doctor needs to check your cervix (mouth of uterus and birth canal), a transvaginal scan may be done as it is more accurate.
Please empty your bladder 1 hour before your appointment, drink 2 glasses of water and try not to empty your bladder again until after your ultrasound.
A full bladder moves bowel out from your pelvis into your abdomen, helping visualisation of the pregnancy, uterus and cervix.
All consecutive antenatal ultrasounds from March 2012 to February 2013 were analyzed.
Routine obstetric ultrasound was done for all women at their booking visit.