5-2 Obstetrics
The calculating methods are listed as follows:
z LMP: input the LMP, the system will calculate the GA and EDD.
z DOC: input the DOC, the system will calculate the GA and EDD.
z IVF: After you enter IVF, the system will calculate GA and EDD.
z PRV: input the date and GA of the last exam, the system will calculate a new GA and EDD.
z BBT: After you enter BBT, the system will calculate GA and EDD.
z EDD: input the EDD, the system will calculate GA and LMP.
2. The clinical GA is shown at the head of the obstetric report.
Tips: The latest EDD and GA calculation is considered as the final value if more than one EDD
and GA calculations are valid.
5.3.2 Ultrasound GA
Ultrasound GA and ultrasound EDD are calculated according to the parameters obtained in
measurements.
GA in OB Items
AUA (Average Ultrasound Age)
CUA (Composite Ultrasound Age)
GA in OB Items
The GA in the OB items is calculated by the related GA tables/ formulae, it is independent from the
clinical GA.
1. You can preset the GA formulae and whether to display EDD or not in [System Preset] -> [OB],
see “2.3 Obstetric Preset” for details.
2. The GA and other measurement values display in the result window after a measurement.
If the Diagnostic GA exceeds the threshold, an OOR (out of range) displays in the result
window and this result is not recorded in the report.
3. The GA of an OB item displays in the right side of the item measurements.
4. For result values used to calculate GA (Gestational Age) and EDD (Estimated Date of
Delivery), the formula used in this calculation can be selected from [Formula].
AUA
AUA is the average of valid GAs that are calculated according to biparietal diameter (BPD), head
circumference (HC), abdomen circumference (AC), femur length (FL), Gestational Sac (GS), crown
rump length (CRL) etc.
1. All valid values of all above items will be involved in AUA calculation in the system default
method.
2. Clicking the check boxes at the right side of related items to select whether to involve the item
in AUA calculation or not. The AUA value varies by the selection.
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