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What is Obdisk?  Why 3?

The Obdisk is a brand new circular pocket pregnancy calculator designed by a clinician for clinicians who need to assess when a  pregnant woman is due to deliver.

The Traditional pregnancy calculator was not designed for Ultra-Sound reports and can only make one calculation at a time. It has been used for over 40 years by antenatal professionals but was only designed to use a single variant - the Date of the Last Menstrual Period (LMP) - to calculate the Expected/Due Date of Delivery (EDD)

The traditional pregnancy calculator only has two discs but by adding a THIRD it is possible to calculate the EDD based on both the U-Sound data and the LMP!

The Obdisk3 makes it easier for a clinician to decide when a baby ought to be delivered. It is more convenient than a computer, cheap to produce, easy to use and accurate.

How to use the Obdisk 3
Position the solid blue LMP arrow with the first day of your Last Menstrual Period (LMP). Follow the calendar round to the LMP/ED arrow to view your due date according to your LMP. Please take into account a variation of +/- 13 days for a due date reading based on LMP.

At your first scan / sonogram, you can be given a SCAN gestation age (the number of weeks pregnant according to the scan / sonogram). Align your SCAN gestational age (number of weeks in red) with the date you had your sacn and then follow the calendar round to the SCAN triangle. This will then give you your date according to the scan / sonogram, which may be different to the date according to your LMP.

Accuracy of SCAN
For SCAN based readings please allow a due date variation of +/- 3 days if your scan was carried out at 12 weeks or +/- 7 days if the scan was carried out at 20 weeks.

LMP: Last Menstrual Period
EDD: Estimated Due Date
SCAN: Due date as calculated by the ultrasound scan.

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