Two common sources of error in blood pH and blood gas analysis were studied. The effect of delay in estimation was studied in 10 volunteers and 40 patients. Syringes were stored at 0°C, (crushed ice), 4°C (refrigerator) and 22°C (room temperature). The pressure of oxygen (Po2) fell significantly by 20 minutes at 4°C and 22°C but did not change significantly at 0°C for up to 30 minutes.
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