What distinguishes arterial blood gas collection from venipuncture in technique and handling?

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Multiple Choice

What distinguishes arterial blood gas collection from venipuncture in technique and handling?

The key idea is that arterial blood gas collection requires sampling from an artery with a heparinized syringe and handling the specimen in a way that preserves the gas tensions. This is why ABG is drawn from an arterial site—typically the radial or brachial artery—and uses a syringe pretreated with heparin to prevent clotting. After the puncture, you apply pressure to the site longer than you would for a venous draw to prevent hematoma because arterial bleeding is under higher pressure. The sample should be kept on ice and analyzed immediately to minimize metabolic changes that can alter pH, PaCO2, and PaO2. Also, you must avoid introducing air bubbles into the sample, as air can significantly distort the gas measurements. In contrast, ABG is not obtained by venipuncture into an EDTA tube, which is used for other blood tests and would not preserve the gas values. Storing ABG samples at room temperature for hours is not appropriate because gas values change over time. Warming the site is not a standard requirement for ABG collection.

The key idea is that arterial blood gas collection requires sampling from an artery with a heparinized syringe and handling the specimen in a way that preserves the gas tensions. This is why ABG is drawn from an arterial site—typically the radial or brachial artery—and uses a syringe pretreated with heparin to prevent clotting. After the puncture, you apply pressure to the site longer than you would for a venous draw to prevent hematoma because arterial bleeding is under higher pressure. The sample should be kept on ice and analyzed immediately to minimize metabolic changes that can alter pH, PaCO2, and PaO2. Also, you must avoid introducing air bubbles into the sample, as air can significantly distort the gas measurements.

In contrast, ABG is not obtained by venipuncture into an EDTA tube, which is used for other blood tests and would not preserve the gas values. Storing ABG samples at room temperature for hours is not appropriate because gas values change over time. Warming the site is not a standard requirement for ABG collection.

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