II. Indication

  1. Evaluation of Diabetes Insipidus

III. Technique

  1. Fluid restriction or Injection of Hypertonic Saline
  2. Measure ADH to Serum Osmolality ratio

IV. Interpretation of ADH to Serum Osmolality ratio

  1. Decreased ratio in Central Diabetes Insipidus
  2. Increased ratio in Nephrogenic Diabetes Insipidus

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