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Blood gases, ions and electrolytes

Blood gas testing is unique in so many ways. First of all, blood gas testing is most commonly requested for patients in a critical, life threatening condition. Such patients may have some serious metabolic or respiratory disorder and need immediate medical intervention. Another prominent feature of the blood gas testing is the invasiveness of the blood collection procedure. Finally, for many of the blood gas parameters stability of the sample is extremely limited. Due to the low biological variability of many blood gas parameters, allowable total error is quite low and even small differences in serial measurements can be clinically meaningful. Blood gas testing therefore requires special attention and continuous quality management. Standardization of all procedures and unquestionable compliance to the recommended practice is the key to the proper quality management. International standards for blood gas and pH analysis as well as for ionized calcium [5, 6] are available and may serve as a basis for such standardization.

blood gas, preanalytical phase, sample

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