Umbilical Artery Doppler Reference Ranges

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 Gestational Age in Weeks   

50th percentile 95th percentile
S/D ratio =
Resistance index =
Pulsatility index =


Acharya G et al. Reference ranges for serial measurements of umbilical artery Doppler indices in the second half of pregnancy.Am J Obstet Gynecol.2005;192:937-44. PUBMED

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