Category: Glucose

BloodAfter excluding 31 patients who did not authorize their medical records to be reviewed for research, 816 simultaneous bGlu and pGlu measurements were found for 197 patients. The mean age of these patients was 56 years (SD, 15.8 years), 95.4% were white, and 51.8% were women. The blood samples had been obtained on four occasions when patients were receiving continuous IV insulin treatment.

On 18 occasions, the bGlu level was reported as 400 mg/dL. In these cases, the mean pGlu level was 423 mg/dL (SD, 110 mg/dL; range, 300 to 900 mg/dL). On 767 occasions, the mean bGlu level was 159 mg/dL (SD, 56.4 mg/dL), and the mean pGlu level was 151 mg/dL (SD, 54.3 mg/dL; p < 0.001). The mean difference between measurements made using the two techniques was 7.9 mg/dL (SD, 17.6 mg/dL), and the limits of agreement were + 43.1 and -27.2 (Fig 1). The pGlu level was elevated on 589 occasions and was nonelevated on 178 occasions, when the pGlu level was between 50 and 400 mg/dL. The mean differences in pGlu and bGlu levels were not statistically significant between the elevated and nonelevated bGlu groups (p = 0.331). In the elevated pGlu group, the mean difference between measurements made using the two techniques was 7.6 mg/dL (SD, 17.1 mg/dL), and the limits of agreement were + 41.8 and -26.6, In the nonelevated pGlu group, the mean difference between measurements made using the two techniques was 9.0 mg/dL (SD, 19.1 mg/dL), and the limits of agreement were + 47.3 and -29.2.

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