Chapter 4: Measurements and Calculations 87
Meas. & Calcs
The following table lists the ratios available for OB Doppler calculations.
Figure 10 OB Doppler Calculation
Table 10: OB Doppler Calculations
Measurement Description S/D RI PI*
MCA Middle Cerebral Artery X X X
Umb A Umbilical Artery X X X
*Calculation requires a trace.
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