DUS 60 Digital Ultrasonic Diagnostic Imaging System User Manual Obstetric Measurements and Calculations
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Chapter 7 Obstetric Measurements and Calculations
The obstetric examination is usually in the B mode and the PW mode.
7.1. Obstetric Measurements and Calculations in B Mode
To enter B mode obstetric examination:
1. Press Exam and select Obstetric, and then press Set.
2. Press to enter B mode.
3. Press Measure to activate the measurement function. The system displays the measurement
menu as shown in figure 7-1.
Items of Measurement and Calculation:
B-OB MEAS: GS, CRL, BPD, HC, AC, FL, EFW, and AFI.
B-OB MEAS 2: TAD, APAD, CER, FTA, HUM, OFD, THD and FBP.
Figure 7-1 Obstetric Measurement and Calculation Menu in B mode
Items of input: LMP and BBT
Fetus growth is usually measurement by the following parameters.
Abbreviations:
EDC: Estimated Date of Confinement
MA: Menstrual Age
LMP: Last Menstrual Period
BBT: Basal Body Temperature
DUS 60 Digital Ultrasonic Diagnostic Imaging System User Manual Obstetric Measurements and Calculations
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EFW: Estimated Fetal Weight
B-OB MEAS: the default measurement is distance measurement.
Label Description Channel Method Results display
GS Gestational Sac Diameter 1
CRL Crown Rump Length 1
BPD Biparietal Diameter 1
Distance (mm)
HC Head Circumference 1
AC Abdominal Circumference 1
Ellipse or Trace
Circumference (mm)
FL Femur Length 1 Distance (mm)
AFI Amniotic Fluid Index 1
Calculating AFI
requires 4 sets of
distance measurement
data, AF1, AF2, AF3,
and AF4.
EFW Estimated Fetal Weight 1
According to the
selected formula,
described as follows.
(g or kg)
The measurement
results will be
displayed in the result
window.
Table 7-1 Obstetric Measurements 1 in B Mode
B-OB MEAS 2: the default measurement is TAD measurement.
Label Description Channel Method Results display
TAD
Transverse Abdominal
Diameter
1
APAD
Antero Posterior Diameter
of the Abdomen
1
CER Cerebellum Diameter 1
Distance (mm)
FTA
Fetus Trunk cross section
Area
1
Ellipse or Trace Area
(mm
2
or dm
2
)
HUM Humerus Length 1
OFD Occipital Frontal Diameter 1
THD Thorax Diameter 1
FBP Fetal Biophysical Profile 1
Distance (mm)
The measurement
results will be
displayed in the result
window.
Table 7-2 Obstetric Measurements 2 in B Mode
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