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Table 2 Results of instrument comparisons with arterial and venous blood in ICU patients and healthy volunteers

From: Validation of a point-of-care capillary lactate measuring device (Lactate Pro 2)

  Estimate (Ratio) 95% CI p-value
ICU patients
 Arterial
  LP2.1 vs ABL 1.03 0.99 to 1.08 0.140
  LP2.2 vs ABL 1.04 0.99 to 1.09 0.102
  LP2.2 vs LP2.1 1.004 0.96 to 1.05 0.871
 Venous
  LP2.1 vs ABL 1.29 1.24 to 1.35 < 0.001
  LP2.2 vs ABL 1.29 1.23 to 1.35 < 0.001
  LP2.2 vs LP2.1 0.998 0.96 to 1.04 0.938
Healthy volunteers
 Arterial, LP2 vs ABL 0.96 0.93 to 1.002 0.063
 Venous, LP2 vs ABL 1.07 1.03 to 1.11 0.001
  1. The results presented in the table are based on mixed effects models with log transformed lactate as the dependent variable. The ratios presented are based on fixed effect coefficients, exponentially transformed to be interpretable as ratios. For example, arterial lactate measurements on the instrument LP2.1 are estimated as 3% higher than measurements on the ABL in ICU patients