A Buffer Standard for Blood pH Measurements

PROVISIONAL pH VALUES FOR CERTAIN STANDARD BUFFER SOLUTIONS

For use in the calibration of electrometric pH assemblies, 17 standard buffer solutions have been investigated, and pH values at 20°, 25°. and 30° C have been assigned to them. The pH values of these solutions range from 2.27 to 11.68 and are considered accurate to ± 0.02 pH unit. Hydrogensilver-chloride cells without liquid junctions were used for establishing the precise pH values of the buff...

pH Measurement with a fiber-optic tissue-pH monitor and a standard blood-pH meter.

Continuous monitoring of the pH of tissue with a glass electrode was initially introduced by Stamm et al. (1). Its potential value in monitoring the high-risk fetus during labor has been demonstrated in several studies (2-4). However, this technique has not been clinically accepted for routine use in labor, mostly because of problems with the application and sustained proper attachment of the r...

A Comparative Study of Blood Glucose Measurements Using Glucometer Readings and the Standard Method in the Diagnosis of Neonatal Hypoglycemia

Background: Hypoglycemia is one of the most common neonatal disorders, associated with severe complications. There has been a great deal of controversy regarding the definition and screening of hypoglycemia. Therefore, in this study, we aimed to determine a cut-off value for blood glucose level in glucometer readings. Methods: This cross-sectional study was conducted on 238 newborns at risk of ...

Physiological HEPES buffer proposed as a calibrator for pH measurement in human blood.

N-(2-hydroxyethyl)-piperazine-N'-2-ethanesulfonic acid, known as HEPES buffer, with pK in the physiological range was studied for use as an alternative to conventional phosphate buffer for the calibration of pH in modern clinical analyzers. In different series of aqueous equimolar HEPES buffer, pH was measured at 37 degrees C with a capillary glass electrode standardized previously using phosph...

Comparison of tissue pH monitor with a standard blood pH meter.