Table 1—

Differences in blood glucose values between the fingertip and alternate sites and Clarke error grid analysis in preprandial, postprandial, and hypoglycemic episode samples, with the 95% limits of agreement

Number of paired BGDsFingertip BGD (mg/dl)SitesBlood glucose differences (mg/dl)Clarke error grid
Zones A + B*Zones D + E
Preprandial
    n = 695190 ± 97F, T−3.5 ± 32 (−66.0, 59.1)98.9%0.4%
    n = 675187 ± 96F, FA−3.2 ± 37 (−76.4, 70.1)97.9%1.8%
Postprandial
    n = 120212.7 ± 82F, T−0.9 ± 35 (−69.0, 67.1)99.2%0.8%
    n = 117224.7 ± 7F, FA0.8 ± 32 (−62.8, 64.4)97.4%2.6%
Hypoglycemia ≤60 mg/dl
    n = 5451.3 ± 6.7F, T−1.0 ± 5 (−10.9, 8.9)100%0%
    n = 4950.5 ± 8.3F, FA−11.5 ± 31 (−73.0, 49.9)79.6%20.4%
  • Data are means ± SD or means ± SD (95% limits of agreement) unless otherwise indicated.

  • *

    * Clinically acceptable zones. BGD, blood glucose determination; F, fingertip; FA, forearm; T, thenar.