If an air bubble is trapped in a venous blood gas, which pattern best describes the effect on analytes?

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Multiple Choice

If an air bubble is trapped in a venous blood gas, which pattern best describes the effect on analytes?

When a venous blood gas sample contains a trapped air bubble, the gas interface disrupts normal gas exchange and lets cellular metabolism continue in the aliquot. Oxygen in the dissolved blood is not replenished quickly enough from the air bubble, so the dissolved pO2 in the sample falls. CO2 produced by metabolism tends to accumulate in the liquid portion because diffusion into the bubble doesn’t rapidly remove it, so pCO2 in the sample rises. The rising CO2 drives the solution toward acidity, lowering the pH. Meanwhile, ongoing glycolysis in the sample consumes glucose and produces lactate, so glucose drops and lactate increases. Together, this pattern—lower pO2, higher pCO2, lower pH, decreased glucose, and increased lactate—is what the option reflecting the trapped air bubble would show.

When a venous blood gas sample contains a trapped air bubble, the gas interface disrupts normal gas exchange and lets cellular metabolism continue in the aliquot. Oxygen in the dissolved blood is not replenished quickly enough from the air bubble, so the dissolved pO2 in the sample falls. CO2 produced by metabolism tends to accumulate in the liquid portion because diffusion into the bubble doesn’t rapidly remove it, so pCO2 in the sample rises. The rising CO2 drives the solution toward acidity, lowering the pH. Meanwhile, ongoing glycolysis in the sample consumes glucose and produces lactate, so glucose drops and lactate increases. Together, this pattern—lower pO2, higher pCO2, lower pH, decreased glucose, and increased lactate—is what the option reflecting the trapped air bubble would show.

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