The well-being of our pets is a key responsibility for all pet owners. When our furry friends require anesthesia, we need to understand why pre-anesthetic bloodwork is critical. This type of bloodwork is conducted by your veterinarian to examine your pet's overall health before administering anesthesia. Our comprehensive guide provides valuable insights into the significance, procedure, and implications of pre-anesthetic bloodwork, giving you peace of mind when your pet undergoes a procedure that requires anesthesia.

Understanding pre-anesthetic bloodwork

Before your pet undergoes any anesthesia-aided treatment, think of pre-anesthetic bloodwork as a health inspection. This process is similar to detective work, seeking vital clues about pet health and identifying any potential health issues that could lead to complications during surgery.

By examining your pet's blood cell counts and organ function in detail, pre-anesthetic bloodwork can be used to identify health concerns before they turn into obstacles. This process should be performed before any treatment requiring anesthesia, including dental procedures or other surgical interventions. It's like checking the weather forecast before a long trip - essential for preventing and addressing potential complications.

Components of pre-anesthetic bloodwork

Here, we will be discussing the primary components of pre-anesthetic bloodwork and their importance in ensuring pet safety during anesthesia.

Complete Blood Count (CBC)

First up, we have the Complete Blood Count, or CBC for short. It's like a roll call for the cells in your pet's blood.

  1. Red Blood Cells: These are the oxygen carriers of your pet's body. The CBC checks their quantity, shape, and hemoglobin content, looking out for conditions like anemia or polycythemia.
  2. White Blood Cells: These are your pet's internal soldiers, responding to inflammation or infection. The CBC not only counts them but also identifies each unique type. This can help spot infections, inflammation, or even more serious conditions like immunodeficiency or cancer.
  3. Platelets: These are the clotting agents, that prevent excessive blood loss. A low platelet count could mean your pet is at a higher risk of bleeding during surgery.

Serum Biochemistry

Next, we have serum biochemistry, a series of tests that examine the levels of various chemicals and enzymes associated with organ function in your pet's blood.

  1. Liver Values: The liver is like the body's chemical processing plant. Tests like ALP, ALT, AST, GGT, and Tbili can indicate liver issues and the potential for liver disease. The liver metabolizes many of the anesthetics so we need to be confident that the liver is functioning properly prior to an anesthetic procedure.
  2. Kidney Function: The kidneys are your pet's natural filtration system. Levels of BUN and creatinine can show if they're working effectively or if there's a risk of kidney disease.
  3. Blood Glucose: This is the measure of sugar in the blood. High levels could be a sign of diabetes. Similarly, low blood glucose can be indicative of liver disease or hypoglycemia and would need to be addressed prior to anesthesia.
  4. Serum Proteins: These include albumin, globulin, and total protein. Abnormal levels can indicate various medical conditions and can affect post-surgical healing.
  5. Electrolytes: These include potassium, sodium, and chloride. Abnormal levels can indicate various disease states that may affect surgical healing or suitability for anesthesia.

How your veterinarian interprets pre-anesthetic bloodwork results

Your veterinarian will take all the data from pre-anesthetic bloodwork and interpret it to assess your pet's overall health and the results of the physical exam. Based on these readings, they will decide if any further testing or treatment is necessary prior to anesthesia. This could be anything from altering medications or selecting a different anesthetic protocol.

For instance, if your pet shows signs of mild dehydration, your veterinarian might opt for intravenous fluids for a longer duration before anesthesia. On the other hand, severe anemia or significantly high liver or kidney values might hit the pause button on surgery until these issues are addressed.

It's important to remember that not all abnormal pre-anesthetic bloodwork results mean a procedure can't be done. It just means that your veterinarian will take additional precautionary measures to ensure your pet's safety during surgery.

Is pre-anesthetic blood work required for every anesthetic procedure?

Preanesthetic bloodwork may not be necessary for all procedures or every patient. For instance, minimally invasive or quick procedures may not require this step, nor may young and healthy pets. In spite of that, when it comes to older pets or those with pre-existing health conditions, utilizing this tool can play a vital role in ensuring their safety. Your veterinarian, equipped with an extensive understanding of your pet's medical background and the intricacies of the procedure, possesses the utmost expertise to assist you in navigating this decision-making process effectively.


In conclusion, pre-anesthetic bloodwork is an essential component of pet safety before any procedure requiring anesthesia. By understanding the significance, components, and implications of pre-anesthetic bloodwork, you can rest assured knowing that your furry friend is in good hands during surgery. Additionally, by conducting these tests, we demonstrate our commitment to the highest standards of care and prioritize your pet's well-being above all else.

For more information on pre-anesthetic bloodwork and other important aspects of pet health, please talk to your veterinarian. They will be able to provide you with the guidance needed to ensure your pet's safety.