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Question:

Cats bloodwork came back with very high calcium

I’m at a complete loss right now and could really use some advice from fellow cat owners. My precious kitty, Oliver, recently had some blood tests done because he wasn't acting like his usual playful self. The results came back, and the vet said his calcium levels are extremely high. I've never dealt with anything like this, and it's terrifying because I don’t really know what it means or what I should be doing. The vet mentioned it could be hypercalcemia, and it might point to anything from diet issues to something as serious as cancer. Oliver’s been my little buddy for over eight years, and I can’t stand the thought of him suffering. Has anyone else experienced this with their cats? What steps did you take, and how did things turn out? I’m trying to stay hopeful, but I’m honestly scared and feeling pretty helpless.

Answer:

Thanks for the question. High calcium levels in your cat's blood, known as hypercalcemia, is something to watch closely. There are several potential causes, ranging from dietary issues to more serious conditions. Common reasons include dehydration, certain diets, or underlying diseases like hyperparathyroidism or some types of cancer.



At home, you can focus on making sure your cat is well-hydrated. Ensure they have constant access to fresh water and you might encourage drinking by offering water in different bowls or a pet fountain. You can also increase the moisture content in their diet by incorporating wet food, if they aren't already on it.



Watch for symptoms like vomiting, constipation, increased thirst, urination, or lethargy. If these occur, or if your cat seems to be in pain or discomfort, it’s time for a deeper dive.



Even if your cat currently seems okay, it's essential to address high calcium levels to prevent any potential problems down the road. I recommend booking a video consult with us on Dial A Vet. We can work together to narrow down the cause and decide on the best and safest steps moving forward.

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 26, 2025

  Book A Vet Consultation
The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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