Reference values of normal fetal ductus venosus Doppler flow measurements at 11-14 weeks of gestation.

[ 20 ] studied 198 singleton pregnancies and the mean DV PI ranged from 1.07 at 38 mm CRL to 1.00 at 88 mm CRL, showing a decreasing trend as CRL increased but the correlation with CRL values did not reach statistical significance.

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