Deficit = TBW × [(Na / 140) - 1]. Total Body Water (TBW) is approx. 60% of weight in men and 50% in women (lower in elderly). Note that total fluid deficit in HHS includes both free water and isotonic losses, often totaling 8–12 Liters.
Verified
Last Review: 2026
Adrogué HJ et al. • N Engl J Med. 2000;The foundational review of sodium balance and free water deficit calculations.
Last Comprehensive Review: 2026
Clinical Context
We think this might be relevant to the clinical guidance for Fluid Deficit Estimator (Free Water).
Clinical Context
We think this might be relevant to the clinical guidance for Fluid Deficit Estimator (Free Water).
Clinical Context
We think this might be relevant to the clinical guidance for Fluid Deficit Estimator (Free Water).
