Umbilical artery, ductus venosus and middle cerebral artery

Evaluation of the umbilical artery Doppler by PW-Doppler. The Resistive index is calculated as the (Peak Systolic Velocity-End Diastolic velocity)/Peak Systolic Velocity. More on the umbilical arterial profile here. 

More information on fetal MCA Doppler here. 

Venous flow Dopplers of IVC and Ductus Venosus

More on ductus venosus Doppler here. 

Article on Ductus venosus Doppler available here.  (Seravalli V, Miller JL, Block-Abraham D, Baschat AA. Ductus venosus Doppler in the assessment of fetal cardiovascular health: an updated practical approach. Acta Obstet Gynecol Scand. 2016 Jun;95(6):635-44. doi: 10.1111/aogs.12893. Epub 2016 Mar 28. PMID: 26946331.)