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Also known as: Vasopressin; AVP
Formal name: Antidiuretic Hormone; Arginine Vasopressin

At a Glance

Why Get Tested?

To help detect, diagnose, and determine the cause of antidiuretic hormone (ADH) deficiency or excess; to investigate low blood sodium levels (hyponatremia); to distinguish between the two types of diabetes insipidus

When to Get Tested?

When you have low blood sodium or have persistent thirst, frequent urination, and dehydration

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?

None needed for an ADH test; however, talk to your health care provider about required preparation when the ADH test is performed as part of a water deprivation ADH stimulation test or a water loading ADH suppression test.