This week we're going into a deep dive on MCA Doppler as Dr. Moise discusses the following:  The initial role & importance of ultrasound in pregnancy – determining crown rump length (CRL) to then calculate the estimated date of delivery (EDD) How MCA Doppler was first discovered – thanks to Dr. Gian Carlo Mari How viscosity and cardiac output are affected in an anemic fetus MCA Doppler peak systolic velocity (PSV) vs. multiples of the median (MoM) Factors that can affect an accurate MCA Doppler reading (here’s where the cop analogy comes in) Angle Fetal movement Software and ultrasound equipment Expertise and experience Rescue steroids (betamethasone) When to start MCA surveillance and how often Definition of fetal hydrops Using MCA Dopplers vs. empiric intervals for timing IUTs Other fetal conditions that utilize MCA Doppler to detect fetal anemia: Non-immune fetal hydrops Parvovirus TAPS in twins MCA MoM Score Calculators: Barcelona calculator: https://medicinafetalbarcelona.org/calc/ Select “Anemia” then “Cerebral Doppler” Perinatology: https://perinatology.com/calculators/MCA.htm Editorial by Dr. Kenneth Moise: “ Diagnosing Hemolytic Disease of the Fetus — Time to Put the Needles Away?” DOI: 10.1056/NEJMe068071

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