Doppler ultrasonography of the fetoplacental circulation : normal reference values

Date
1989
Journal Title
Journal ISSN
Volume Title
Publisher
Health & Medical Publishing Group
Abstract
Normal reference values for the resistance index, A/B ratio and pulsatility index of the umbilical artery obtained by Doppler ultrasonography are presented. The resistance index and A/B ratio values are very similar to those previously published, indicating no need for formulate normal values for different populations. The pulsatility index differed from other published values, probably reflecting different calculation methods built into the spectrum analysers rather than differences in waveforms. The resistance index had the lowest coefficient of variation and showed least inter-observer variation. For routine use the resistance index is preferable to other indices.
Description
CITATION: Pattinson, R. C. et al. 1989. Doppler ultrasonography of the fetoplacental circulation : normal reference values. South African Medical Journal, 76:623-625.
The original publication is available at http://www.samj.org.za
Keywords
Doppler ultrasonography
Citation