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OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–18
Other OB Calculation Formulas (cont’d)
Calc
Mnemonic
Calc Name
Input
Measurements
Formula
Author
Reference
GS
Gestational
Sac
one distance
Known LMP Case:
Rempen
Sac
Unknown LMP Case:
CRL
Crown Rump
Length
one distance
Known LMP Case:
Length
Unknown LMP Case:
BPD
Biparietal
Diameter
one distance
Known LMP Case:
Diameter
Unknown LMP Case:
BPD
Biparietal
Diameter
one distance
Known LMP Case:
Hansmann:
Ultraschalldiag nostik in
Diameter
Unknown LMP Case:
Ultraschalldiag–nostik in
Begurtshilfe und
CRL
Crown Rump
Length
one distance
Known LMP Case:
g
Gynakologie 1985
Length
Unknown LMP Case:
HC
Head
Circumference
Average of BIP
Average of FRO
HC [mm = 2.325*
(BPD [mm] ^2 +
OFD [mm] ^2)^0.5
ThD
Transverse
Thorax
one distance
Known LMP Case:
Thorax
Diameter
Unknown LMP Case:
FL
Femur Length
one distance
Known LMP Case:
Unknown LMP Case:
AC
Abdominal
Circumference
one distance
Known LMP Case:
Circumference
Unknown LMP Case:
EFW
Estimated
Fetal Weight
Average of BPD
Average of AC
EFW[g] =
–3200.40479 +
157.07186 * AC[cm] +
15.90391 * BPD [cm]
Merz, et al.,
Womens Hospital,
University of Mainz
BPD
Biparietal
Diameter
one distance
Curve data is
available in the
Advanced Reference
Tokyo Shinozuka Method,
1996
APTD x TTD
(AxT)
Antero
Posterior
Trunk
Diameter
Transverse
Trunk
Diameter
two distance
Advanced Reference
Manual
Table 9–6. OB Calculation Formulas—Other Selections (cont’d)
Содержание 500
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