Water Deprivation Test Results
Parameter | Normal | Complete ArginineVasopressin Deficiency | Partial ArginineVasopressin Deficiency | Complete ArginineVasopressin Resistance | Partial ArginineVasopressin Resistance | Primary Polydipsia |
|---|---|---|---|---|---|---|
Uosm after dehydration (step 1) | Very high (> 700–800 mOsm/kg [> 700–800 mmol/kg]) | Very low (less than plasma osmolality) | Low (≥ 300 mOsm/kg [≥ 300 mmol/kg]) | Very low (less than plasma osmolality) | Very low (less than plasma osmolality) | High (500–600 mOsm/kg [500–600 mmol/kg]) |
Uosm increase after vasopressin (step 2) | Minimal (< 5%) | 50 to > 100% | 15–50% | < 50 mOsm/kg (<50 mmol/kg) | Up to 45% | No change |
Uosm = urine osmolality. | ||||||
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