PMID: 8601Jan 1, 1976

The reliability of pH-values in fetal blood samples - A study of the second stage

Journal of Perinatal Medicine
H Boenisch, E Saling


In 119 cases fetal blood analysis (FBA) was done in the last 15 minutes before birth together with blood sampling from the umbilical artery (UA) immediately after delivery before the first breath. Using the measured pH-values we investigated the relationship between these variables, in particular the degree of influence of considerable caput succedaneum on pH-values in peripheral blood. Our investigation was performed during the time just before delivery, when the disturbance of blood circulation in the presenting fetal part whuld have the highest influence on pH-values measured from peripheral blood samples. We kept in mind especially the critiques of FBA by WULF et al. [21] and ASSALI [2]. As other authors have concluded, we found a high degree of correlation between the pH evaluated by FBA and that determined in the umbilical artery blood. The coefficient of correlation was: pHact r=0.82 pHqu40 r=0.78. The relationship between the corresponding pHvalues in peripheral (FBA) and arterial (UA) blood is given in Fig. 1 a and Fig. 1 b. The correlation of quadrants showed for the actual pH as well for the pHqu40 p less than 0.01. As derived form this, a high degree of correlation between the pH-values can be seen. The mean pH-valu...Continue Reading

Related Concepts

Collection of Blood Specimen for Laboratory Procedure
Collateral Circulation
Umbilical Cord Blood
Hydrogen-Ion Concentration
Labor Onset
Antenatal Screening Procedures
Regression Analysis
Structure of Umbilical Artery
Obstetric Delivery

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