Congratulations on your Pregnancy!
To work out your due date using your last menstrual period, remember it is the date of the first day of your last menstrual period (i.e. the first day of vaginal bleeding), rather than the last day of bleeding.
How Accurate is the Due Date?
Did you know that only approximately 5% of babies are born on their due date!
An ultrasound scan early in the pregnancy (<12 weeks) is very useful for accurate dating, especially if you are not certain about the date of your last menstrual period, or if your periods are irregular. The accuracy of a transvaginal scan <12 weeks gestation has an accuracy of +/- 5 days.
As the pregnancy progresses, the accuracy of ultrasound scans for dating diminishes. At the morphology scan between 18-20 weeks gestation, the accuracy of the scan for dating is +/- 2 weeks. This is because every baby grows at different rates, and as the baby has had more time to grow, there can be more individual variations in size. Therefore, whilst the morphology scan may indicate a different due date to your original due date, the agreed due date established at your booking in visit will not be altered by the morphology scan dating.
To discuss this further, and to book in with Dr Law for your management of your pregnancy and delivery at Greenslopes Maternity, click on the “Book Now” button at the top of the page, and note any preferred times for your appointment. One of Dr Law’s secretaries will contact you to confirm your appointment.
Alternatively, call (07) 3188 5000 to make an appointment.
Dr Ken Law
MBBS (Hons), FRANZCOG
Dr Ken Law is a trusted Obstetrician and Gynaecologist in Brisbane with extensive experience attained in Australia and overseas.
He is a passionate Brisbane Obstetrician delivering babies at Greenslopes Maternity, offering women attentive care from conception to all stages of pregnancy and delivery.
Dr Ken Law is also a leading Brisbane Gynaecologist specialising in minimally invasive gynaecological surgery using laparosopic (“keyhole”) and robotic technologies.