Contraindications are absolute unless specified otherwise.
If there is evidence of infection or peripheral vascular disease involving the selected limb, an alternate site should be selected. The PaO2 of samples drawn from subjects with elevated white cell counts may decrease very rapidly. 7.2.1 Sample must be obtained anaerobically and anticoagulated, with immediate expulsion of air bubbles. 7.2.3.2 If lyophilized heparin is used, the minimum volume drawn depends on the design of the analyzers and the need for other assays. The term cork describes any device designed to allow insertion of the sample needle point after withdrawal from the artery.