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We studied the interchangeability of two blood gas syringes (Johns, Hardie Health Care Products Pty Ltd and Marksman, Martell Medical Products Inc) for the collection of blood for the analysis of PCO 2 , PO 2 , pH, sodium, potassium and glucose in 71 intensive care unit patients. The interchangeability of these two syringes with a specially designed syringe (Radiometer, Radiometer A/S) for the collection of blood for the analysis of ionized calcium was also studied. Analysis of pH, sodium, potassium and glucose showed no clinically significant differences between samples collected with Johns and Marksman syringes. However, differences in PCO 2  and PO 2  in samples collected with these syringes may be clinically significant if the PO 2  is less than 100 mmHg. There were no clinically significant differences in ionized calcium levels in blood samples collected with Johns, Marksman and Radiometer syringes. We conclude that Johns and Marksman syringes are interchangeable for the collection of blood for the analysis of PCO 2 , PO 2 , pH, sodium, potassium and glucose and they are also interchangeable with Radiometer syringes for the collection of blood for ionized calcium analysis.

A Comparison of Syringes to Collect Blood for Analysis of Gases, Electrolytes and Glucose