Normal Blood Glucose Ranges for Cats

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Maintaining a proper blood glucose level can be tricky business, as even a healthy cat's glucose level changes throughout the day — the normal cat glucose levels range from 80 to 120 mg/dL. If the vet detects a higher than normal blood glucose level in your cat, she'll require a few more tests to determine the cause. If your cat has diabetes, you and your vet will have to work together to ensure her glucose level remains in a normal range throughout the day.


Cats can get diabetes.
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Normal cat glucose levels

A cat's normal glucose range may climb higher than between 80 and 120 mg/dL if the cat is stressed or frightened. Blood glucose levels are ruled by insulin, the hormone produced by the pancreas. If your cat's pancreas isn't producing sufficient insulin, her glucose levels rise. In addition to stress, pancreatitis, diet and infection also can cause higher than normal glucose readings; if your vet detects a high level, he'll conduct other tests to gain a more clear picture. It might also be helpful to refer to a cat blood sugar levels chart.


Testing for feline diabetes

The vet will first consider if your cat's showing symptoms of diabetes, including weight gain or loss, and increased thirst, urination, and appetite. Since the stress of the vet visit can cause her glucose level to spike, he'll want to determine that the high level isn't a stress reaction. A complete blood count as well as a blood chemistry profile will help the vet to determine if there are other potential illnesses present or related conditions that could cause an elevated glucose level.


A urinalysis also is helpful because when a cat's glucose level is higher than 240 mg/dL, or sugar is present in the urine. As well, urine might contain other hints of diabetes, including pus, bacteria, and high numbers of ketone bodies. Tests, symptoms, and medical history will help confirm a diagnosis of diabetes, as well as whether it's related to an underlying condition.


Managing cat glucose levels with insulin

Insulin can be used with cats.
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If there's something at work causing the increased glucose level, treatment will address the root cause of the hyperglycemia. If the diagnosis is diabetes, your cat likely will need regular insulin injections to manage her glucose level. Since a fluctuation in blood glucose levels can have a significant impact on your cat's health quickly, it's critical to follow the vet's directions.


Even when you follow the instructions, chances are your cat's insulin needs will change over time as her body changes. That means you'll need to stay in regular contact with your vet to ensure your cat is getting the proper amount of insulin. You might work with your vet to do this at home with a handheld glucose meter, or you might rely on the vet to do the testing with a glucose curve, or cat blood sugar levels chart.


Cat blood sugar levels chart

A glucose curve helps the vet to ensure your cat is receiving the correct insulin dose by tracking how her blood glucose level responds through the day. After the cat has her morning meal, an initial blood draw is taken just before her morning insulin injection. Blood samples are collected every two hours throughout the day for 12 hours.


The glucose levels are plotted to generate a curve (or chart) and the vet determines how, or if, to adjust her insulin injections. Ultimately, the vet strives to build a dosing schedule that will keep her glucose level between 120 and 300 mg/dL throughout the day. Glucose curves are performed every two to four months after the cat is stabilized.


Fructosamine test to determine cat glucose levels

While the glucose curve is a snapshot of half a day, a fructosamine test can give an idea of where the glucose levels are over the period of a couple of weeks. Fructosamine is a compound that forms when certain blood proteins and blood sugar come together. A stable compound that forms slowly, its presence indicates consistently high blood sugar.

Cat glucose levels home check

Changes in her energy, food, and water intake and urinary habits are indicators that she may need some adjustments to her insulin.
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Paying attention to your cat's behavior will give you a good idea of how she's doing — changes in her energy, food, and water intake and urinary habits are indicators that she may need some adjustments to her insulin. A urine test strip also will tell the tale; when you're ready to dip her strip, switch her litter box for a clean box lined with non-absorbing plastic pellets instead of standard absorbing kitty litter. Strips change color depending on the presence of glucose in the urine. Your vet will guide you on how to interpret the results and their impact on the insulin dosage.