Interferences with potentiometry of CO2 in the Ektachem 400 Analyzer.

Factitiously high sodium activities on the Ektachem 400 owing to interferences by high gamma-globulin concentrations.

Sera from patients with above-normal gamma-globulin concentrations give sodium values as much as 10% higher when measured in the Kodak Ektachem 400 analyzer than results obtained with the Beckman Astra-8 analyzer. Results obtained with the Astra were in agreement with flame photometry. A similar relative bias was observed for potassium measurement in the Ektachem. This discrepancy was corrected...

Clinical evaluation of Eastman Kodak's Ektachem 400 Analyzer.

We evaluated the performance of the Kodak Ektachem 400 Analyzer in a 16-week clinical trial. We assessed four potentiometric tests and nine colorimetric tests for precision and correlation with results obtained some other commonly used instruments (Technicon SMA II and C800 System, Du Pont aca II, and Baker CentrifiChem). The comparison was favorable for all tests except albumin, sodium, and ca...

Positive interferences with the Ektachem total CO2 assay from therapy with topical cerous nitrate.

Effect of pyridostigmine bromide on serum bromide concentration and the anion gap.

B romide (Br) causes positive interference with all clinical laboratory methods for the detenmination of serum Cl (1 .2). Interference with Cl measurement is much greater with ion-selective electrode (ISE) technology (1 .3) than with coubometry (1 -4). We recently described a patient ingesting therapeutic amounts of pynidostigmine Br (MestInon1 , containing 1 8.4 mg of Br [30.6%j per 60-mg tabl...

Evaluation of an engineering model of the "EKTACHEM" analyzer for glucose and urea assay.

We report results of a 21-week evaluation of an engineering model of the Kodak “EKTACHEM Glu/BUN Analyzer.” This novel clinical instrument measures glucose and “urea nitrogen” (actually, urea) in a minimum of 30 j.tL of body fluids by use of the principles of thin, multilayer film analysis and reflectance spectrophotometry. We compared the performance of the instrument to that of the Dupont aca...