Which is the best sign that the specimen is arterial during collection?

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Multiple Choice

Which is the best sign that the specimen is arterial during collection?

The main idea here is recognizing arterial blood by its flow pattern during collection. Arteries operate under higher pressure, so blood enters the syringe in a pulsatile, heartbeat-driven way. Seeing a pulse-like movement of blood into the syringe is the most reliable cue that you’re in an artery. Color can also hint at arterial blood, since arterial blood is bright cherry red due to higher oxygen content, but color alone isn’t definitive because lighting, exposure, and other factors can affect appearance. Air bubbles are not a sign of arterial origin and must be avoided, as they indicate potential air contamination. Blood that looks dark bluish red points to venous blood, not arterial. So, the best sign is the pulsatile flow into the syringe, reflecting arterial pressure and flow.

The main idea here is recognizing arterial blood by its flow pattern during collection. Arteries operate under higher pressure, so blood enters the syringe in a pulsatile, heartbeat-driven way. Seeing a pulse-like movement of blood into the syringe is the most reliable cue that you’re in an artery.

Color can also hint at arterial blood, since arterial blood is bright cherry red due to higher oxygen content, but color alone isn’t definitive because lighting, exposure, and other factors can affect appearance. Air bubbles are not a sign of arterial origin and must be avoided, as they indicate potential air contamination. Blood that looks dark bluish red points to venous blood, not arterial.

So, the best sign is the pulsatile flow into the syringe, reflecting arterial pressure and flow.

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