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Doppler Matrix (UA/MCA)

Doppler Surveillance Matrix

Utero-Placental Haemodynamics

Umbilical Artery (UA)

Primary marker of placental resistance. Decreased or reversed end-diastolic flow (AEDF/REDF) indicates severe failure.

Middle Cerebral (MCA)

Reflects fetal compensation for hypoxia. Decreased PI indicates "Head Sparing" shunting.

Cerebroplacental (CPR)

MCA PI / UA PI Ratio. Index < 1st centile is the most sensitive predictor of adverse outcomes.

Critical Red Flags (UA)

AEDF

Absent End Diastolic Flow

REDF

Reversed End Diastolic Flow

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Primary Clinical Uses

Fetal surveillance in pregnancies complicated by Fetal Growth Restriction (FGR)

Monitoring maternal-fetal hemodynamics in early-onset and late-onset preeclampsia

Screening and diagnosing fetal anemia (via MCA Peak Systolic Velocity)

Guiding the optimal timing of delivery in chronic placental insufficiency

When NOT to Use

Routine Doppler screening in universally low-risk, uncomplicated pregnancies is not recommended as it does not improve perinatal outcomes and may precipitate unnecessary anxiety and iatrogenic interventions.

Last Comprehensive Review: 2026