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How much Vetsulin U40 for my diabetic cat & when to check blood?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 8 years and 3 months old | 15 lbs

My newly diabetic cat get Vetsulin U 40. Vet says increase slowly and watch for signs of improvement. His blood-glucose level is an average 246. On a U 40 syringe, I'm up to #5 on the lines, is the 5 units? How much insulin should I be giving him? What's the best time to check his blood-glucose? Does his eating before or after blood checks make a difference? Help! Thanks!

1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on August 30th, 2019

If the insulin and syringe is U40 then yes, 5 should be 5 units (it is important to use the same graded syringes and insulin as this would invalidate the graduations otherwise). Blood glucose should be checked resting and fasting as a meal or strenuous exercise will affect readings - a schedule of timings before meals/exercise should be arranged in order to compare readings. Changes the the dose rate given should be made only in consultation with the treating vet - we are not legally in a position to prescribe medication as the animal must be under the direct care and supervision of the prescribing vet in order to make these decisions

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