Interlaboratory Comparison of Radioimmunoassay Results

A comparison of the interlaboratory reproducibility of the Hansen radioimmunoassay for carcinoembryonic antigen.

Interlaboratory comparison of results of erythrocyte protoporphyrin analysis.

Each of 65 laboratories analyzed 10 whole-blood samples for erythrocyte protoporphyrin by one or more of several analytical procedures. These procedures were of two types: (a) extraction of protoporphyrin from the erythrocytes into ethyl acetate/acetic acid, re-extraction into hydrochloric acid, and fluorometric measurement; or (b) direct reading in a portable fluorometer (hematofluorometer), w...

Comparison of radioimmunoassay results in serum and plasma.

The protocol of the experiment was designed as follows. In the morning, the instrument was prepared for operation by calibration and verification with whole blood gas control samples (Quantra; Dade Division of American Hospital Supply Corp., Miami, FL 33152). An IL blood gas control, ContrIL, was analyzed for P02 before and after the determination on blood from the patient in surgery. Two level...

Comparison of interlaboratory results for blood lead with results from a definitive method.

Results reported by 113 participants in the Blood Lead Proficiency Testing Program conducted by the Center for Disease Control were compared with those obtained by the National Bureau of Standards (NBS) with a definitive methods (mass spectroscopy-isotopic dilution) for blood lead analyses. Data were compiled from the results obtained for 12 whole-blood samples containing 1.5 g of disodium EDTA...

Interlaboratory comparison of simmondsin analysis

Eleven samples containing various amounts of simmondsin (S), simmondsin ferulate (SF), demethyl simmondsins (DMS) and didemethyl simmondsins (DDMS) were analyzed by five different laboratories. The samples were made from chromatographically pure simmondsin, animal feed formulations containing jojoba meal, defatted jojoba meal, water extracts of jojoba meal and combinations of these ingredients....