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  • Title: Single-injection method for evaluation of renal function with 14C-inulin and 3H-tetraethylammonium bromide in dogs and cats.
    Author: Fettman MJ, Allen TA, Wilke WL, Radin MJ, Eubank MC.
    Journal: Am J Vet Res; 1985 Feb; 46(2):482-5. PubMed ID: 3994117.
    Abstract:
    A double-isotope single-injection method without urine collection for the estimation of glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) in dogs and cats was evaluated. The GFR was determined, using 14C-inulin and ERPF was determined, using [3H]tetraethylammonium bromide. Using a modified single exponential, 1-compartment mathematical model, the renal clearance of these solutes was estimated with a plasma radioactivity disappearance curve constructed from samples collected over a 150-minute time period. In 25 dogs, GFR, ERPF, and filtration fraction were 3.55 +/- 0.14 ml/kg/min, 10.51 +/- 0.72 ml/kg/min, and 0.34 +/- 0.02, respectively. In 25 cats, GFR, ERPF, and filtration fraction were 3.24 +/- 0.14 ml/kg/min, 8.14 +/- 0.53 ml/kg/min, and 0.39 +/- 0.02, respectively. This time-efficient and reliable method, using beta-emitting isotopes, yielded renal functional values well within the normal ranges reported by a variety of other isotopic and nonisotopic procedures. The advantages of the present procedure over previous double-isotope single-injection methods include the use of less costly, lower energy-using, and less penetrating beta emittors, as well as a shortened blood sampling schedule.
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