0.4 ml blood
Use arterial blood samplers (such as Marquest Micro A.B.G. available from carts). There should be no or minimal exposure to atmospheric air during collection. Expel any air bubble before capping the syringe, place on ice and deliver to Lab immediately accompanied by a blood gas requisition. VENOUS BLOOD GAS INCLUDES PH, PCO2 AND PO2
0.4 ml heparinized blood (on ice)
0.3 ml heparinized blood (on ice) (Neonates)
Report p50 value under BG comment field. If there's no p50 value, report number under comment field: Unable to calculate p50 due to low or high s02 (as appropriate).