settle umbilical and fetal middle cerebral arteries Doppler indices( pulsatility index and resistive index) in normal pregnancy to generate a local reference range and calculate cerebroplacental ratio.
Study Type
OBSERVATIONAL
Enrollment
520
pulsatility index of umbilical artery.
Time frame: Through study completion, an average of 1 year
Resistive index of umbilical artery
Time frame: Through study completion, an average of 1 year
pulsatility index of fetal middle cerebral artery.
Time frame: Through study completion, an average of 1 year
Resistive index of fetal middle cerebral artery
Time frame: Through study completion, an average of 1 year
settle cerebroplacental ratio local reference range.
Time frame: Through study completion, an average of 1 year
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