A single-blood-sample method using inulin for estimating feline glomerular filtration rate.

Area of Science:

• Veterinary Medicine
• Nephrology
• Diagnostic Imaging

Background:

• Estimating glomerular filtration rate (GFR) in cats is crucial for diagnosing and managing kidney disease.
• Conventional multi-sample inulin methods for GFR assessment in felines are time-consuming and complex.

Purpose of the Study:

• To develop and validate a simplified, single-blood-sample method for estimating GFR in cats using inulin.
• To compare the accuracy of the novel single-sample method against the established three-sample method.

Main Methods:

• A retrospective study involved nine cats (six healthy, three with chronic kidney disease).
• Inulin was administered intravenously, with blood samples collected at 60, 90, and 120 minutes for the conventional method.
• Serum inulin concentrations were measured colorimetrically, and GFR was calculated using dose, concentration, time, and estimated distribution volume.

Main Results:

• The single-blood-sample method demonstrated an excellent correlation (r = 0.99, P = .0001) with the conventional three-sample method.
• This indicates high accuracy and reliability of the simplified GFR estimation technique.

Conclusions:

• The single-blood-sample inulin method is a practical and ethical alternative for estimating GFR in cats.
• This simplified approach can improve the efficiency and accessibility of feline kidney function diagnostics.