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Table 1 Scheme for calculating the fluid retention index (FRI), which is the mean of the dehydration scores for 4 urinary indexes of fluid retention

From: Preoperative fluid retention increases blood loss during major open abdominal surgery

Fluid retention score 1 2 3 4 5 6
Specific gravity ≤ 1.005 1.010 1.015 1.020 1.025 1.030
Osmolality (mOsmol/kg) < 250 250–450 450–600 600–800 800–1000 > 1000
Creatinine(mmol/l) < 4 4–7 7–12 12–17 17–25 > 25
Colour (shade) 1 2 3 4 5 6
  1. From Hahn and Waldréus 2013