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OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–17
Other OB Calculation Formulas (cont’d)
Calc
Mnemonic
Calc Name
Input
Measurements
Formula
Author
Reference
BPD
Biparietal
Diameter
one distance
Curve data is
available in the
Advanced Reference
Hadlock, JUM 1:97, 1982
AC
Abdominal
Circumference
circumference by
trace, ellipse, circle
or two distances
Advanced Reference
Manual
Hadlock, AJR, 139 : 367,
1982
HC
Head
Circumference
circumference by
trace, ellipse, circle
or two distances
Hadlock, AJR, 138 : 649,
1982
CRL
Crown Rump
Length
one distance
NELSON
BPD
Biparietal
Diameter
one distance
KURTZ
BD
Binocular
Distance
one distance
BERKOWITZ
EFW
Estimated
Fetal Weight
Average of BPD and
Average of TAD
[mm]
EFW[kg] = 0.515263
–(0.105775*BPD)+
(0.000930707*
(BPD)
2
) +
(0.0649145*TAD) –
(0.00020562*
(TAD[mm])
2
)
German
EFW
Estimated
Fetal Weight
Average of BPD and
Average of AC [cm]
EFW [g] =
10
ƞ
(3–1.7492 +
0.046*AC +
0.166*BPD –
0.002646*AC*BPD)
Shepard : Richards/
Berkowitz
EFW
Estimated
Fetal Weight
Average of FL,
Average of AC and
Average of HC [cm]
EFW [g] =
10
ƞ
(1.5662 –
(0.0108*HC) +
(0.0468*AC) +
(0.171*FL) +
(0.00034*(HC)
2
) –
(0.003685*AC*FL) )
Hadlock, Radiology,
150 : 535, 1984
FL/HC
FL/HC ratio
Average of FL and
Average of HC
FL/HC
Hadlock, JUM, 3 : 439,
1984
Table 9–6. OB Calculation Formulas—Other Selections (cont’d)
Содержание 500
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