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OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–10
USA Method
Transf CALCS is only available with Realtime Doppler Calculation option installed
CRL
GS
BPD
FL
AC
USER1
OB
Report
HC
USER3
USER2
USER4
USER5
AFI
OB
Graph
OB
Report
ANATOMY
SURVEY
Select
Locatn
S/D
Ratio
RI
A/B
Ratio
TRACE
AUTO
Transf
CALCs
PI
1
HEART
RATE
OB
Graph
OB
Report
Page 1
Page 2
Page 3
Page 4
Figure 9–3. USA Sub-Menus
Calc
Mnemonic
Calc Name
Input
Measurements
Formula
Author
Reference
HR
Heart Rate
(beats/minute)
one 2 beat time (Measured
manually or automatically)
HR[BPM]= 120[sec]/2
beat time[sec]
n/a
GS
Gestational
Sac
three distances
GS=(d1+d2+d3)/3+
3.6225
Hellman, A/OG,
103: 789,1969
CRL
Crown Rump
Length
one distance
CRL=1.
0.31
0.049306xd1^2+
0.004057xd1^3+
0.000120456xd1^4
Hadlock,
Radiology,
182:501, 1992
FL
Femur Length
one distance
FL = –3.91 + 0.427
(GA) – 0.0034 (GA)
2
Hadlock et al,
Radiology,
152:497 501
BPD
Biparietal
Diameter
one distance
BPD = –3.08+0.41
(GA) – 0.000061 (GA)
3
152:497–501,
1984
AC
Abdominal
Circumference
circumference by trace, el-
lipse, circle or two distances
AC = –13.3 + 1.61 (GA)
– 0.00998 (GA)
2
HC
Head
Circumference
circumference by trace, el-
lipse, circle or two distances
HC = –11.48 + 1.56
(GA) – 0.0002548
(GA)
3
Hadlock et al,
Radiology,
152:497–501,
1984
Table 9–3. OB Calculation Formulas Part 1—USA Version Factory Defaults
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