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Estimation of the tensions of respiratory gases and pH in fetal blood has become more common in recent years since SALING [6] introduced sampling of fetal scalp blood during labor. Measurement of pH, p02 and pC02 in umbilical artery and vein blood is also used in the assessment of the condition of the newborn. Because of the influence of pC02 on the 02-content (BOHR effect), and of 02 -saturation, and consequently, of p02 on C02-content (HALDANE effect), there is an interdependence between pH, 02-content, 02-pressure, C02-content and C02pressure. This relationship can be represented in the form of nomograms, enabling one to obtain the desired variables if at least two values are known. EDWARDS et al. [1] established the first graphic representation of dissociation characteristics of respiratory gases in fetal blood. The nomogram constructed includes p02 and pC02 as well as 02and C02-contents. HELLEGERS et al. [3] provided a nomogram relating three variables in fetal blood: p02, pH and percent saturation of hemoglobin. FISCHER et al. [2] introduced the first nomogram depicting the interdependence of pO2, 02-content, percent saturation of hemoglobin, pC02, C02-content and pH, thus enabling one to derive four variables if the other two are known. In order to examine the validity of these three nomograms, the six interdependent variables of p02, 02-content, pH, pC02, C02-content and

Validity of nomograms relating the tensions of respiratory gases and pH in fetal blood