"PSV: peak systolic velocity"
"EDV: end-diastolic velocity"
"TAV: time-averaged velocity"
"previous pregnancy with IUGR or fetal death in utero"
"umbilical arterial S/D ratio (SDR): systolic velocity / diastolic velocity"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"umbilical arterial S/D ratio (SDR): systolic velocity / diastolic velocity"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"pulsatility index (PI) (Gosling index): (PSV - EDV) / TAV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"resistive index (RI) (Pourcelot index): (PSV - EDV) / PSV"
"PSV: peak systolic velocity"
"EDV: end-diastolic velocity"
"TAV: time-averaged velocity"
Expected headings
"Indications"
"Maternal conditions"
"Pregnancy-related conditions"
"Waveform"
"Parameters"
"Classification"
"Further assessment tools"
"External links"
"The spectral Doppler indices measured at the fetal end, the free loop, and the placental end of the umbilical cord are different with the impedance highest at the fetal end. The changes in the indices are likely to be seen at the fetal end first. Ideally, the measurements should be made in the free cord, however, for consistency of recording in cases being followed up, a fixed site would be more appropriate, i.e. fetal end, placental end, or intra-abdominal portion. Due to difficulty with measuring the cord at the fetal end in many growth-restricted fetuses, measurement in a free loop is acceptable 7."