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Table 2 Number and percentage of flow indices at different cutoff levels

From: Sublingual microcirculation does not reflect red blood cell transfusion thresholds in the intensive care unit—a prospective observational study in the intensive care unit

 Total (n)MFI < 2.5, n (%)MFI ≥ 2.84, n (%)PPV ≥ 88, n (%)
Before RBCTAfter RBCTBefore RBCTAfter RBCTBefore RBCTBefore RBCT
All645522 (34)6 (11)21 (32)22 (34)
TTH 75 g/l433916 (37)3 (8)13 (30)16 (37)
TTH 90 g/l21166 (29)3 (20)8 (38)6 (29)
SENS/SPEC    0.66/0.910.64/0.82
PpV/NpV    0.91/0.850.64/0.83
  1. RBCT red blood cell transfusion, MFI microvascular flow index, PPV proportion of perfused vessels, TTH transfusion threshold, SENS sensitivity, SPEC specificity, PpV positive predictive value, NpV negative predictive value