Which handling practice can cause a falsely decreased TCO2 result?

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Multiple Choice

Which handling practice can cause a falsely decreased TCO2 result?

Total CO2 readouts come from dissolved CO2 and bicarbonate in the sample, and they are very sensitive to gas exchange with the environment. If the cap is left open, CO2 can escape from the liquid into the air, lowering the CO2/bicarbonate balance and producing a falsely decreased TCO2 result. Keeping the cap on prevents this gas loss and helps preserve the true value. Transporting the sample on ice slows metabolic activity, which also helps maintain the CO2/bicarbonate balance rather than cause a drop. Using a nonheparin anticoagulant isn’t the factor that directly causes a decrease in TCO2 when the sample is handled properly; the critical issue here is preventing exposure to air to avoid CO2 loss.

Total CO2 readouts come from dissolved CO2 and bicarbonate in the sample, and they are very sensitive to gas exchange with the environment. If the cap is left open, CO2 can escape from the liquid into the air, lowering the CO2/bicarbonate balance and producing a falsely decreased TCO2 result. Keeping the cap on prevents this gas loss and helps preserve the true value. Transporting the sample on ice slows metabolic activity, which also helps maintain the CO2/bicarbonate balance rather than cause a drop. Using a nonheparin anticoagulant isn’t the factor that directly causes a decrease in TCO2 when the sample is handled properly; the critical issue here is preventing exposure to air to avoid CO2 loss.

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