11 Measurement and Report
Operator’s Manual 11 - 19
Calculation and study items
Obstetric Formula
The obstetric formulae are used in the GA and EFW calculations.
•GA Formulae
THD Thoracic Diameter Distance
Sac Diam1 Gestational Sac Diameter 1
Sac Diam2 Gestational Sac Diameter 2
Sac Diam3 Gestational Sac Diameter 3
AF1 Amniotic Fluid 1
AF2 Amniotic Fluid 2
AF3 Amniotic Fluid 3
AF4 Amniotic Fluid 4
Cervix L Cervical Length Distance, Trace and Spline
UT L Uterine Length
UT H Uterine Height Distance in 2D Basic Measurements
UT W Uterine Width
Endo. Endometrium Thickness
UT A Uterine Artery 2PT, Manual, Spline, Auto
Ovarian A Ovarian Artery
Ovarian V Ovarian Vein Velocity
FHR Fetal Heart Rate Heart Rate
Tools Descriptions Methods in Basic Measurement
Type Tools Measurement items Methods or formulae
Calculation TCD/AC TCD and AC Measures the TCD, and calculates
the ratio of TCD/AC
Mean Sac Diam Sac Diam1, Sac Diam2, Sac
Diam3
Measures three diameters by
Distance method and calculates the
average value
EFW Estimated Fetal Weight 1 EFW is calculated by the default
EFW formula, based on multiple
measured parameters. The formula
can be reselected in the OB report.
EFW2 Estimated Fetal Weight 2
Study AFI AF1, AF2, AF3, AF4 Measures in Distance method and
calculates AFI
Uterus UT L, UT H, UT W, Endo Distance in Basic Measurement
Ovary Ovary L, Ovary H, Ovary
W
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