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Monitoring a diabetic cat at home
The free layer: daily observation
The technical layer: glucose numbers
Cornell's monitoring guidance describes two home options vets use. A pet glucometer reads a tiny blood sample, usually from an ear vein or paw pad - quick for the cat once both of you have the knack, and your vet team can teach the technique. A continuous glucose monitor is a small sensor the vet places on the cat's skin that records readings every few minutes for a few days up to two weeks; it removes the pokes and gives a full picture between visits. Which one, how often, and what numbers to act on are vet decisions - the dose rules are cat-specific, and changing insulin off your own readings without guidance is how hypoglycemia happens.
What your vet actually wants recorded
Ask, but the usual list is: glucose readings with time relative to meals and doses, doses given (including missed or partial ones), appetite, water intake, weight, and anything unusual - vomiting, low energy, wobbliness. Patterns over two weeks tell a vet far more than a careful retelling. The glucose and dose log on this site stores entries on your own device and prints cleanly for appointments, and the PawLine app keeps the same kind of history alongside your cat's other records.
Red flags between scheduled checks
Call the vet the same day for: not eating, repeated vomiting, marked lethargy, or weakness. Treat wobbliness, disorientation, trembling, or seizures as an emergency - that's possible hypoglycemia, covered in life with insulin. And call before the next scheduled visit if readings run persistently higher or lower than the range your vet gave you, rather than adjusting the dose yourself.