Six automated instruments that measure sodium and potassium were tested for interference
from two compounds used in catheters. Tridodecylmethylammonium heparin did not …

We have identified rare (approximately 0.2% of all samples), but clinically significant,
discrepancies between serum or plasma sodium concentrations measured with the Kodak …

Biomedical, Newton, MA) ion-selective electrode type of analyzer relative to that obtained
with flame photometry. They were concerned because their results were in disagreement …

An automated analyzer for the measurement of potassium and sodium in whole blood has
been developed and evaluated. The sensors used in this instrument are the sodium glass …

We evaluated the Technicon RA-1000" random-access" analyzer for the measurements of
sodium, potassium, and carbon dioxide by an indirect potentiometric method (ion-selective …

An ion-selective electrode incorporating valinomycin in a poly (vinyl chloride) membrane
was used for examining potassium in blood and plasma. Using an electrode cell …

We compared different sample-handling techniques for measurement of Na+ and K+ with
ion-selective electrodes (ISE). Imprecision was less for venous blood (with a minimum of …

A simple method for the direct determination of the K+ concentration in undiluted blood
serum is described. The reproducibility of single determinations using the readings after 60 …

Method Sodium and potassium concentrations were measured in both whole blood and
plasma from a series of 21 patient samples using a Corning 902 ISE. The difference …

Sir: Theaccurate determination of potassium for both clinical and research purposes is of
recognized importance. In thepast such determinations were performed by flame …