Bloodwork

 

 

    

CBC

A CBC (Complete Blood Count) provides an inside look at the blood itself. Blood is composed of different types of cells in addition to the liquid portion. It is important to know the status of each during sickness, health, or prior to surgery.

 

  • Red blood cells are responsible for carrying oxygen throughout the body.

  • White blood cells are one of the body's primary means of fighting infection.

  • Platelets play an important role in blood clotting and are critical in helping the body to stop bleeding.

Chemistry

Blood chemistry tests provide an inside look at your pet's vital organs. By testing blood chemistries, we can evaluate the status of the liver and kidneys, as well as the blood sugar and electrolyte balance.

T4

T4 (Thyroid hormone) evaluates how much thyroid hormone the thyroid gland is producng. Elevated levels can alert us that the thyroid is over-producing and something can be done to prevent problems such as high blood pressure, heart problems, and severe weight loss. Hyperthyroidism is common in senior cats. Hypothyroidism is rare in cats (although in dogs hypothyroidism is common and hyperthyroidism is rare).

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People frequently ask if "everything" is tested with lab work. Unfortunately, no. If so, all we (or human physicians) would ever need to do is collect some blood to get a diagnosis. Think of it this way...if you were trying to put together a 100 piece puzzle (without the cover picture!) and you received 3 or 4 pieces, you would have very little information to go by. If you received pieces with a football-shaped eye featuring an up-and-down pupil, a set of whiskers, and a triangular nose, you would have an idea that the picture was of a cat. If you then got a couple triangular ears, a kitty mouth, and some fur, you would be on your way to completion. Baseline lab work is like puzzle pieces. It helps with the big picture but does not tell you everything.  Sometimes, x-rays, ultrasound, special lab tests, and other tests need to be performed to obtain more puzzle pieces to help the doctor figure out the big picture.

 

Another common question is if lab work tests for cancer. We do not have the luxury of having a "cancer test" that can be run. Sometimes the CBC will reveal abnormal cells that alert us to certain types of cancer such as leukemia. There are a few blood values that could lean in the general direction of cancer, but they do not give an absolute answer. Generally, if other problems can be ruled out (problems with kidneys, liver, heart, thyroid, etc.) and there are significant problems (severe weight loss, vomiting, diarrhea, etc.), cancer may be suspected, and a hunt for further answers is conducted.

 

From our laboratory: 4 common questions about blood work and your pet

 

For information on urine tests, see our Urinalysis Page.

 

For information on blood pressure measurement, see our Blood Pressure Measurement Page.

© 2018 by The Cat's Meow Veterinary Hospital.

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