
Chapter 5.Measurements and Calculations 5 - 21
OB Calculations
▐ Before Obtaining OB Calculations
OB Basic Information
Type the information needed for OB diagnosis in the patient information window.
■ Enter LMP, then EDD (Estimated Delivery Date) and GA (Gestational Age) are
automatically calculated. LMP is required for the calculation of values such as EDD
and SD.
- EDD (LMP) = LMP + 280days
- GA (LMP) = Current System Date - LMP
■ A maximum of four fetuses can be input in the Gestations item. The default item
value is ‘1’. In the case of twins, enter ‘2’.
For further information about patient information menus and how to input patient
information, refer to ‘Entering Patient Data’ in ‘Chapter 3 Settings’.
OB Measurement Menu Setup
Set GA Equation, GA Table and OB Measurement menus. The user can manually write,
back up and restore the GA Table. For more information on GA Equation and Table,
refer to the Reference Manual.
For more information about other measurement menus and setup, refer to ‘Setting
Measurements’ in ‘Chapter 3. Settings’.
▐ Measurement Items
Measure Fetal Biometry, Fetal Cranium, Fetal Long Bones, AFI, etc.
■ GS, CRL, YS, BPD, OFD, HC, APD, TAD, MAD, AC, FTA, FL, SL, TTD, APTD, and
APTD * TTD are included in Fetal Biometry.
■ HUM, ULNA, TIB, RAD, FIB, CLAV, and Vertebral are included in Fetal Long Bones.
■ In Fetal Cranium, CEREB, OOD, IOD, CM, NF, NT, and Lateral Ventricle are
included.
■ FOOT, EAR, and MP are included in Fetal Others.
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