What differentiates arterial blood gas collection from venous collection, and what are the critical handling steps?

Prepare for the CAMLPR Specimen Collection Competency Test. Practice with diverse question sets including multiple-choice and flashcards. Each question includes hints and explanations to help you become proficient before the exam.

Arterial blood gas testing relies on the actual gas content of arterial blood, so the sample must come from an artery and be preserved to reflect true pH, PaCO2, PaO2, and related values. This requires a heparinized syringe to prevent clotting without diluting the blood, since dilution or clotting can skew the measurements. Keeping the sample anaerobic means minimizing exposure to air so that diffusion of gases in or out of the blood doesn’t alter pO2 or pCO2. Sealing the syringe and transporting it quickly to a analyzer preserves the gas tensions before the blood changes due to metabolism or diffusion. These handling steps differentiate arterial sampling from venous collection or non-anticoagulated tubes, and from storing samples at room temperature for hours, which would all distort the results.