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Written by All Care Veterinary Network. Medically reviewed by Dr. Sam Rollins
Some of your pet’s most important health information is invisible from the outside. Many illnesses may not show outward signs until months later, but bloodwork can help detect where signs are absent.
A physical exam tells your veterinarian a lot about what's happening on the outside. Bloodwork shows what's happening on the inside: how the kidneys and liver are working, how the body handles sugar, whether the immune system is fighting something, and much more. It's one of the simplest ways to catch problems early, when they're easier to treat and often less costly to manage.
It may seem odd to run bloodwork on a pet who's full of energy and feeling great, but that's the best time to do it.
Every pet is a little different. Some healthy dogs and cats naturally run a bit high or low on certain values. A baseline panel, taken while your pet is well, shows what normal looks like for your pet specifically, not just for pets in general.
Here's why that matters:
Think of it like a growth chart for your pet's health. One reading is helpful. A series of readings tells the whole story.
Ready to get started? Schedule a baseline bloodwork panel at your pet's next wellness visit.
Bloodwork can flag a wide range of conditions, often before your pet shows any signs. Here are some of the most common.
Kidney disease is one of the most common conditions in older cats, and one of the hardest to spot at home. Signs like increased thirst, more frequent urination, and weight loss often don't appear until much of the kidneys' function is already lost.
Bloodwork can pick up changes much earlier. A test called SDMA, often included in routine panels, is designed to flag kidney decline sooner than traditional markers. Catching it early gives you more time and more options, from diet changes to medications that help slow progression.
Diabetes affects both dogs and cats and changes how the body uses sugar. Bloodwork measures glucose levels and can show whether sugar is building up in the bloodstream. Caught early, diabetes can often be managed well with diet, insulin, and regular monitoring.
The liver filters toxins and supports digestion. Elevated liver values can point to infection, inflammation, medication effects, or other underlying issues that need a closer look.
Older cats are prone to an overactive thyroid, while dogs more often develop an underactive one. Both can affect weight, energy, coat, and heart health, and both are very treatable once diagnosed.
Bloodwork alone usually can't diagnose cancer, but it can raise important red flags. Abnormal white blood cell counts, unexplained anemia, or elevated calcium levels can all prompt your veterinarian to look further with imaging or other tests.
A complete blood count (CBC) shows whether your pet has enough healthy red blood cells and whether the immune system is responding to infection or inflammation somewhere in the body.
Pets on long term medications, such as those for arthritis pain or seizures, need periodic bloodwork to make sure their organs are handling treatment well.
Curious what a panel includes? See our bloodwork and lab testing services.
Routine bloodwork catches many problems before symptoms appear. Some changes are still worth a call to your veterinarian sooner, especially if they last more than a few days:
These signs don't always mean something serious, but bloodwork is often one of the first and fastest ways to find out what's going on.
Most healthy adult pets benefit from bloodwork once a year, and seniors every 6 to 12 months. Your veterinarian will tailor the schedule to your pet. See recommendations by life stage.
The best time to learn what's normal for your pet is before anything goes wrong. A quick blood draw at your next wellness visit can give you peace of mind today and a valuable reference for years to come.
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