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Uptodate Reference Title
Doppler waveforms in types 1, 2, and 3 sFGR
Doppler waveforms in types 1, 2, and 3 sFGR
(A) Type 1 sFGR. Persistently forward umbilical artery end-diastolic flow without variation in the waveform and normal or elevated resistance. (B) Type 2 sFGR. Fixed absent or fixed reversed umbilical artery end-diastolic flow without variation of the waveform in the smaller twin. (C) Type 3 sFGR. Variable umbilical artery flow pattern that cycles between forward, absent, and reversed flow over a short interval.