Table 1.

Threshold level of hydration biomarker

Biomarker indicator	Threshold
Serum Sodium(17)	1. 135–145 mEq/L (Well-hydrated)
	2. >145 mEq/L (Dehydrated)
Urine Specific Gravity (USG)(14)	1. 1⋅021–1⋅026 (Slightly dehydrated/Hypohydration)
	2. >1⋅026 (Chronic dehydration)
Urine Colour(18)	1. Score of 1–3 (Well-hydrated)
	2. Score of 4–6 (Slightly dehydrated)
	3. Score of 7–8 (Dehydrated)
Urine Osmolality(18)	1. <500 mOsm/kg (Normal)
	2. ≥500 mOsm/kg (Dehydrated)
Serum/Plasma Osmolality(19)	1. ≤299 mOsm/kg (Normal)
	2. >299 mOsm/kg (Dehydrated)