CVA Laboratory Techniques & Diagnostic Procedures 3

Question 1

What is the correct needle angle for venipuncture of the cephalic vein in a dog?

Accepted Answer

15–30 degrees

Answer

A 15–30 degree angle allows the needle to enter the vein smoothly without passing through the opposite wall.

Question 2

Which finding on a urinalysis sediment examination is most indicative of a bacterial urinary tract infection?

Accepted Answer

Bacteria and white blood cells (pyuria)

Answer

The combination of bacteria and white blood cells (pyuria) in urine sediment strongly suggests active bacterial infection.

Question 3

A packed cell volume (PCV) of 18% in a cat most likely indicates:

Accepted Answer

Anemia

Answer

Normal PCV in cats is 24–45%; a PCV of 18% is below the reference range, indicating anemia.

Question 4

When reading a fecal flotation slide under the microscope, which objective lens is typically used first?

Accepted Answer

4x or 10x (low power)

Answer

Low-power objectives (4x or 10x) are used first to scan the entire coverslip area before switching to higher magnification for identification.

Question 5

What is the purpose of adding EDTA anticoagulant to a blood collection tube?

Accepted Answer

It chelates calcium to prevent clotting

Answer

EDTA chelates (binds) calcium ions, which are required for the clotting cascade, thus preventing coagulation.

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