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  • Title: Single-injection inulin clearance for routine measurement of glomerular filtration rate in cats.
    Author: Haller M, Rohner K, Müller W, Reutter F, Binder H, Estelberger W, Arnold P.
    Journal: J Feline Med Surg; 2003 Jun; 5(3):175-81. PubMed ID: 12765628.
    Abstract:
    Glomerular filtration rate (GFR) was determined in 53 cats using an inulin single-injection method. Thirty healthy young adult cats were used to establish normal values. The procedure was also used in 23 cats that were either older than 10 years or had borderline serum creatinine levels. The total clearance was calculated from the decay of the serum inulin concentration after injection of 3000 mg/m(2)body surface area using a two-compartment model. Concomitant inulin and iohexol clearance in nine cats showed excellent correlation between the two methods. Calculated normal values for GFR in 30 healthy cats were 35.9-58.5 (median 46.0) ml/min/m(2)or 2.07-3.69 (median 2.72) ml/min/kg. A few cats with normal creatinine or blood urea nitrogen levels were detected as having reduced GFR and therefore being in a state of early renal dysfunction. The study indicates that single-injection inulin clearance is a valuable tool for routine GFR measurement in cats. An "inulin excretion test" using only one blood sample 3h after the administration of 3000 mg/m(2)body surface area could prove an attractive alternative for the assessment of renal function in daily practice.
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