Long-term reproducibility of a new pH/blood-gas quality-control system compared to two other procedures.

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Abstract
The long-term precision and stability of a new quality-control system for blood pH and gas measurements are compared to that of tonometered bicarbonate solutions and serum-based preparations. The new system, consisting of gas-equilibrated bicarbonate solutions in glass ampuls, is shown to be as stable as the serum-based preparation, and as reproducible as either of the other methods. The new system, offering three discrete sets of control values, has certain advantages in the simultaneous quality of pH, carbon dioxide tension, and oxygen tension measurements.

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