Pre-Surgical Blood Tests: The Pre-Anaesthetic Panel Explained
Short answer
A pre-anaesthetic panel checks your pet's blood, liver, kidneys, protein and sugar before surgery. See what is tested, why it matters and what to ask your vet.
By Pashupatinath Vet Lab Share
A pre-anaesthetic panel is a set of blood tests done before surgery to check your pet's blood cells, liver, kidneys, protein and blood sugar. It can help detect hidden problems that raise the risk of anaesthesia, and your registered veterinarian uses the results with your pet's signs and history to plan the surgery.
Why blood tests before anaesthesia?
During anaesthesia, the body works under extra strain. Blood carries oxygen to every organ. The liver and kidneys help break down and clear anaesthetic drugs. Anaesthesia can also lower blood pressure and the blood flow to organs.
A pet can look healthy and still have a hidden problem, such as anaemia or early liver or kidney disease. Blood tests can help your vet choose suitable drugs and monitoring, or delay surgery until a problem has been looked into. This applies to any procedure under anaesthesia, such as spaying or neutering, a dental procedure, lump removal or fracture repair.
Many vets ask for these tests before every anaesthetic, and especially for older pets, unwell pets, pets on long-term medicine and pets that have had a health problem before. In a young healthy pet, the results also give a baseline, which is a record of normal values to compare with in future.
What is in the Pre-Anaesthetic Panel
The Pre-Anaesthetic Panel covers eight tests, for dogs and cats:
- Complete Blood Count (CBC) counts red cells, white cells and platelets. It can help detect anaemia and infection.
- ALT (SGPT), AST (SGOT) and ALP are markers of the liver.
- Creatinine and BUN are markers of kidney function.
- Total protein can point to liver, kidney or gut problems, or poor nutrition.
- Glucose is the blood sugar level. Low or high sugar can cause trouble during anaesthesia.
The panel uses about 5 mL of blood, in a plain tube (for serum, the clear part of clotted blood) and an EDTA tube (for whole blood). On the day:
- A small blood sample is taken from a vein.
- The lab tests the sample. Routine results are normally ready the same day or within 24 hours.
- The report is shared digitally by WhatsApp or email, and also inside your account under My Reports.
- Your vet checks the report before deciding on the anaesthesia plan.
Extra tests your vet may add
The panel is a common starting point, but the right tests depend on your pet's age, breed, health and the type of surgery. Your vet may add:
- Electrolytes (body salts such as sodium, potassium and chloride), if your pet has had vomiting, diarrhoea or dehydration.
- Clotting tests such as Prothrombin Time (PT) and APTT, if there is a history of bleeding or liver disease.
- A blood parasite smear for tick fever, in dogs with fever, pale gums or tick exposure.
- A urine test, a heart tracing (ECG) or a chest X-ray, especially for older pets. The panel does not check the heart or lungs.
For older pets, some vets choose a wider panel, such as the Comprehensive Vital Panel, which adds full liver and kidney function tests and a blood parasite smear.
Before the test and the surgery
- Follow fasting instructions exactly. Your vet will tell you when to stop food and water. Young puppies and kittens, small breeds and diabetic pets may need different advice, because they can develop low blood sugar. Never decide this on your own.
- Tell your vet everything. Mention medicines, supplements, recent vaccines, vomiting, cough, fever, or any earlier reaction to anaesthesia.
- Bring old reports. Earlier blood reports and vaccine cards help your vet compare and plan.
- Ask about the plan. Ask your vet when to bring your pet, how long the procedure is expected to take, and when you can take your pet home.
- Plan the timing. The test can often be done a day or so before surgery. This leaves time to act on any problem. Ask your vet when to do it.
If a result is out of range
An out-of-range value does not always mean surgery is off. Your vet may repeat the test, add more tests, change the anaesthesia plan, treat the problem first or move the surgery date. This is a sensible step to protect your pet. A normal panel does not remove all risk, but it helps your vet plan with care.
When to talk to your vet
Ask your vet which tests suit your pet before the surgery date is fixed. Call your vet if your pet gets a cough, fever, vomiting, diarrhoea or stops eating before surgery. Do not give any medicine or supplement before surgery unless your vet agrees.
Pashupatinath Vet Lab provides free sample collection anywhere in Bhopal. Call or WhatsApp +91 88175 01118 to book. From other towns, samples can be sent to the lab by courier, bus parcel or through your local veterinarian. You can browse all lab tests for Dog and Cat on this website.
This article is general information and does not replace a veterinarian’s advice. Please talk to a registered veterinarian about your animal’s signs, tests and treatment.