This private blood test measures antidiuretic hormone (vasopressin), used to help investigate conditions affecting your body's fluid balance, such as diabetes insipidus. The test costs £212.50, plus a £50 blood-draw fee, with results usually available in 10 days.
You can walk in or book online at 117a Harley Street, seven days a week.
Written by Mr Stephen Lingam. Reviewed by Dr Mohammad Bakhtiar (GMC 4694470) on 28/09/2026.
It measures antidiuretic hormone (vasopressin), used to help investigate conditions affecting your body's fluid balance, such as diabetes insipidus.
The test costs £212.50. A separate £50 blood-draw fee applies.
Results are usually available in 10 days.
No GP referral is needed. You can walk in or book online.