Fig. 2From: Implementation of continuous-wave Doppler ultrasound to detect the high-risk foetus in the low-risk mother: lessons from South AfricaFlow diagram of participants in the study protocolSF, symphysis fundal height; CWDU, continuous-wave Doppler ultrasound; RI, resistance index; AFI, amniotic fluid index; AEDF, absent end diastolic flow; CTG, cardiotocographBack to article page