Testing Your Diabetic Cat's Glucose at Home (Step-by-Step)
Roxy Velez
A practical walkthrough for cat parents just starting out with home glucose monitoring
When Adonis was diagnosed with feline diabetes, daily glucose testing felt overwhelming. Now it's just part of our routine — and honestly, part of our bonding time. This is exactly how we do it, from kit setup to post-test treat.
Still on the fence about whether home testing is worth it? Read this first: Why Home Glucose Testing is Essential for Diabetic Kitties
🧰 What's in the Testing Kit
I keep everything on a tray. It sounds small but it makes a real difference — you're not scrambling when your cat is already in position.
Here's what we use:
- Lancet device + extra lancets
- Glucometer + testing strips
- Cotton
- Vaseline (a tiny bit)
- Alcohol-free antiseptic
- Diabetic-friendly treats — the most important part
🩸 Step 1: Prep the Lancet
Change your lancet regularly. I keep fresh ones in the kit so I'm never skipping this step.
Most standard lancet devices have a back circle that lets you swap without ever touching the needle: press to pop the old one out, insert the new one, twist off the cap. That's it.
On gauge size: The gauge tells you how thick the needle is — higher number means thinner needle. If you're just starting out, go with 28 gauge lancets. They're slightly thicker, which makes it easier to get a blood drop from the ear, especially while the ear is still getting used to being poked.
We used 28 gauge for Adonis's first month. Once we could consistently get a good drop, we switched to 30 gauge — and now we use one of the lowest depth settings on the device.
If all you have right now is a standard lancet, it's fine. Just use a stronger depth setting.
New to all of this and not sure where to begin? How to Get Started with Home Testing walks you through the full setup from scratch — tools, mindset, everything.
🐾 Step 2: The Spa Momento 🐾
This is Adonis's famous pre-test ritual — and it's not just for show. It actually works.
Warm up the ear. If it's not already warm, use a rice sock (there's a tutorial on that). Then take a small amount of cotton and massage the ear gently. Add a very thin layer of vaseline over the test spot and keep massaging.
Why vaseline? It stops the blood from smearing into the fur, which makes it much easier to collect a clean drop on the strip.
Warm ear + massage = better circulation = easier bleed when you poke. And throughout all of this, I'm talking to him, complimenting him. They really do pick up on your energy.
📊 Step 3: Prep the Glucometer
Insert a testing strip into the glucometer — it'll give you a small window of time to poke and collect the blood before the strip times out.
Close the strip container immediately. We learned that the hard way. Exposed strips go bad.
👂 Step 4: Finding the Sweet Spot
The top side of the ear is where you want to poke. If you hold your cat's ear up to the light, you'll see the vein structure.
Avoid the big vein that runs along the outer edge. Poking directly on a vein means too much blood and possible bruising. Aim just beside it. If you accidentally hit it, apply pressure until the bleeding stops — it's fine, it happens.
💉 Step 5: The Poke
One hand holds the ear with a cotton underneath. My other hand rests gently on top of his head so he doesn't move. Then I poke — and immediately apply slight pressure with my fingers to help the blood come out.
Each glucometer needs a slightly different amount of blood. You'll learn to read it as you go.
📋 Step 6: Collect, Check, Log
Once there's enough blood, I touch the strip to it. The glucometer reads the number.
I log every result in his spreadsheet — the one from the Feline Diabetes Support Group on Facebook. Having all his daily glucose data in one place is essential for managing his insulin dose decisions. Don't skip this step.
🧴 Step 7: After the Test
Apply gentle pressure with a cotton until the bleeding stops, then disinfect. We use a regular alcohol-free antiseptic from the pharmacy — I asked specifically for something super gentle. You can also disinfect before the test. We weren't told to do this; it's just our personal extra step.
Then: treats. Diabetic-friendly treats, always.
🐱 A Note on Positioning (for When You're Just Starting Out)
In the early days, I'd sit right behind Adonis with my knees on either side of him — legs curved around him like soft walls, just enough to keep him gently in place without making him feel trapped. I'd hold his face gently with both hands to keep him steady while I massaged his ear.
Secure, not trapped. There's a difference and cats know it.
Talk to your cat through the whole process in your calmest voice. Confidence is contagious — so is anxiety.
💛 Questions?
Leave them in the comments. Every cat is different and I'm happy to help where I can. 💛
Adonis is a diabetic cat managed with daily home glucose testing and insulin. This post reflects our personal routine and is not a substitute for veterinary guidance.
