title: Development of a solid-phase radioimmunoassay for the determination of arginine-vasopressin in urine.
abstract: A new solid-phase radioimmunoassay (RIA) has been developed for measuring arginine-vasopressin (AVP) in urine. AVP is first extracted from urine by adsorption on Vycor glass powder and eluted with acetone-water (60:40). The mean recovery is 75.3 +/- 2.2% (n = 18). The organic extract is evaporated to dryness and reconstituted in the assay buffer. Aliquots of this extract are then incubated with 125I-AVP in polystyrene LKB tubes previously coated with the antiserum (1:50000) for 48 hours. The free radioactive fraction is removed by aspiration and the tubes are counted. Values correlate well with those obtained by liquid-phase RIA using dextran-charcoal. Urinary AVP concentrations in normal Sprague-Dawley rats and rats with varying degrees of hydration have been measured.
mesh_terms: D000818:Animals; D001127:Arginine Vasopressin / Q000276:immunology / Q000652:urine*; D008297:Male; D011863:Radioimmunoassay / Q000379:methods*; D051381:Rats; D014882:Water-Electrolyte Balance
chemical_list: D001127:Arginine Vasopressin