Lab Information Manual

Laboratory:	Clinical Biochemistry
Test Name:	WATER DEPRIVATION TEST - (P and U) Test Code: --
Clinical Information:	This procedure is used as a test of anti-diuretic hormone (ADH) reserve in patients with suspected Diabetes Insipidus. Serum and urine osmolality and electrolyte levels are used to monitor patient’s response to oral water restriction. This procedure is performed in the Endocrinology & Metabolism Clinical Investigation Unit.
Collection Devices:	Preferred Devices: 1 - Li Heparin Plasma Separator Tube(s) - Full Tube Collection Li Heparin Plasma Separator Tube(s) - Full Tube Collection Manufacturer: BD (Becton Dickinson) Catalogue #: 367962 - And - 1 - Urine Collection Container, Random 100 mL Urine Collection Container, Random 100 mL Manufacturer: Starplex Scientific Inc. (Etobicoke, ON) Catalogue #: 3008-1
Specimen Required:	Plasma: 1.0 mL Pediatric Plasma: 0.3 mL AND a 5 mL urine aliquot from a random urine collection.
Referral:
Requisition:	_SH Biochemistry Hematology Requisition (R250-10-92) _SH Hospital Biochemistry Hematology Non Winnipeg Brandon (R250-10-91) _SH Winnipeg Brandon Biochemistry Hematology Requisition (R250-10-94) _SH Winnipeg Brandon Hospital Biochemistry Hematology Requisition (R250-10-93) _SH Urine Testing Requisition (R250-10-95)
Reference Values:	An Endocrinologist will interpret laboratory results.
Availability:	Endocrinology Consult Required
See Also:	OSMOLALITY - (U) SODIUM - (U) OSMOLALITY - (P) SODIUM - (P)
More Information:	Urgent sodium and osmolality determinations are required to rapidly monitor the progression of dehydration. This should be arranged with the laboratory at least 24 hours in advance. Specimens for ADH (Arginine Vasopression) analysis, if requested, are sent to Hospitals-In-Common for analysis. Special collection and handling is required; click on hyperlink above for more information.