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Updated: Dec 23, 2025

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
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Human umbilical vessel diameters and bloodgas tensions in the first two minutes after delivery

W D McCallum, R M McAreavey

    Gynecologic Investigation
    |January 1, 1976
    PubMed

    Human umbilical vein and artery diameters reduce significantly during the first 2 min after delivery, whereas blood gas tensions do not change significantly. Gas tension changes, therefore, cannot account for the reduction in the umbilical vessel diameters which occurs during this time.

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