Umbilical cord blood pH and Apgar scores as an index of neonatal health

Am J Obstet Gynecol. 1987 Oct;157(4 Pt 1):843-8. doi: 10.1016/s0002-9378(87)80069-8.


In an effort to determine the clinical usefulness of Apgar scoring and cord pH in neonatal management, specimens of umbilical cord blood were obtained after 257 of 329 consecutive deliveries at a community-based hospital. A notable number of babies who were born in a vigorous state were in fact acidotic (umbilical arterial pH greater than 1 SD below mean). Seventy-two percent of acidotic babies had an Apgar score greater than 7 at 1 minute, and 92% had an Apgar score greater than 7 at 5 minutes. Correlation coefficients of Apgar scores at 1 and 5 minutes and arterial pH with the health status of newborn infants were poor. A chi 2 analysis of arterial pH and Apgar scores at 1 and 5 minutes indicated that a larger number of sick babies had an Apgar score less than 7 and acidosis than expected by pure chance. However, the sensitivity values of the Apgar score at 1 minute (0.48) and 5 minutes (0.24) and the arterial pH (0.40) for predicting sick children limit the clinical usefulness of these tests. While technically feasible in a community hospital, routine cord pH measurements add little to neonatal evaluation and management.

Publication types

  • Comparative Study

MeSH terms

  • Acid-Base Equilibrium*
  • Acidosis / diagnosis
  • Apgar Score*
  • Asphyxia Neonatorum / diagnosis
  • Fetal Blood / analysis*
  • Health Status*
  • Health*
  • Humans
  • Hydrogen-Ion Concentration
  • Infant, Newborn
  • Prospective Studies
  • Time Factors
  • Umbilical Arteries
  • Umbilical Veins