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results in the initial emergency department evaluation of a convenience sample of patients with suspected diabetic ketoacidosis. Forty-four episodes of diabetic ketoacidosis with complete arterial blood gas and venous blood gas data were analyzed. Venous blood gas sampling was performed during line placement, and all samples were taken before treatment. The mean arterial pH was 7.20G0.14 compared to a venous pH of 7.17G0.13, with an average difference of 0.03 (r =0.9689).
The authors concluded that venous pH reliably correlated with arterial pH in patients with suspected diabetic ketoacidosis.
This was a small prospective study that compared arterial capillary blood gas results with finger capillary blood gas results in patients presenting with diabetic ketoacidosis. Twenty patients with diabetic ketoacidosis had samples analyzed for pH, HCO 3 , and PCO 2 approximately 2 hours after treatment was initiated. The mean arterial pH was 7.07G0.15, compared with the mean capillary pH of 7.04G0.15, with a mean difference of 0.03 (r=0.89). The mean PCO 2 and HCO 3 values also significantly correlated between the arterial and capillary samples, although the capillary values were slightly higher than the arterial values.
The authors concluded that compared with arterial blood gas samples, capillary blood samples could reliably determine the acid-base status in patients with diabetic ketoacidosis.
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