Is the sampling site along the umbilical artery significant?

Sharon Perlman, Ran D. Goldman, Hila Maatuk, Einat Ron, Eric Shinwell, Isaac Blickstein

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The purpose of umbilical blood sampling is to obtain accurate reflection of fetal acid-base status at birth. The site along the umbilical artery from which blood should be sampled postpartum was not specified. We evaluated if blood gases and pH values from three sampling sites along the umbilical artery are different. After defining the range of intraobserver (method) variability, blood pO2, pCO2, and pH were directly determined. The data showed consistent and significant increases in arterial pH and pCO2 values and decreases in pO2 values from near the fetal cord insertion to the placenta. The largest difference was noted between the fetal site and the placental plate and the smallest between the site near the placental cord insertion and the placental plate. We conclude that the site of cord blood sampling should be standardized and the umbilical artery should be sampled at a site nearest to the neonate.

Original languageEnglish
Pages (from-to)172-175
Number of pages4
JournalGynecologic and Obstetric Investigation
Issue number3
StatePublished - 2002
Externally publishedYes


  • Blood gases
  • Blood pH
  • Umbilical cord


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