[Precision and accuracy of 21 methods in clinical chemistry using diluted samples (author's transl)]

The precision and accuracy of 21 methods in clinical chemistry (sodium, potassium, calcium, chloride, phosphorus, iron, copper, bilirubin, uric acid, urea, creatinine, total serum protein, triglycerides, glutamate-oxalacetate-transaminase, glutamate-pyruvate-transaminase, alpha-hydroxybutyrate-dehydrogenase, alkaline phosphatase, lactate dehydrogenase, gamma-glutamyl-transpeptidase, acid phosphatase, amylase) were studied after diluting samples 1 : 2 and 1 : 4. Dilution of 1 : 2 did not show any significant effect on the precision and accuracy of the studied methods. In case of chloride, phosphorus, iron, bilirubin, uric acid, urea, creatinine, total serum protein, triglycerides, glutamate-oxalacetate-transaminase and alkaline phosphatase reliable results were obtained also after 1 : 4 dilution.