Citation, DOI, disclosures and article data
Citation:
Weerakkody Y, Knipe H, Yap J, et al. Umbilical arterial pulsatility index. Reference article, Radiopaedia.org (Accessed on 18 Apr 2024) https://doi.org/10.53347/rID-71455
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
Umbilical arterial pulsatility index (UA-PI) is a parameter used in umbilical arterial (UA) Doppler assessment. It is calculated by subtracting the end-diastolic velocity (EDV) from the peak systolic velocity (PSV) and then dividing by the time-averaged (mean) velocity (TAV):
Reference ranges depend on the stage of gestation. In normal pregnancies, umbilical arterial pulsatility indexes start at higher values and then decrease progressively towards term. This indicates normal placental development, where there is a progressive decrease in the impedance of the umbilical vascular bed to blood flow.
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