CVA Laboratory Sample Handling 4

Question 1

When collecting a urine sample for culture and sensitivity, which collection method is preferred to avoid contamination?

Accepted Answer

Cystocentesis

Answer

Cystocentesis (needle aspiration directly from the bladder) provides the most sterile urine sample for bacterial culture, avoiding urethral and environmental contamination.

Question 2

A fecal flotation test is used to detect which type of parasites?

Accepted Answer

Eggs and oocysts of intestinal parasites

Answer

Fecal flotation uses a high-density solution to float parasite eggs and oocysts to the surface for microscopic identification.

Question 3

Which anticoagulant tube is used when collecting blood for a complete blood count (CBC)?

Accepted Answer

Purple/lavender top (EDTA)

Answer

EDTA (purple/lavender top) is the anticoagulant of choice for CBC because it best preserves cell morphology and prevents clotting without affecting cell counts.

Question 4

How should a blood smear be stored if it cannot be stained immediately?

Accepted Answer

Air-dried and protected from dust and moisture

Answer

Blood smears should be air-dried quickly and stored in a clean, dry slide box to preserve cell morphology until staining.

Question 5

What is the correct temperature for storing most urine samples awaiting analysis?

Accepted Answer

Refrigerated at 2–8°C

Answer

Urine samples should be refrigerated at 2–8°C to slow bacterial growth and cellular deterioration, ideally analyzed within 30–60 minutes of collection.

(CVA) Certified Veterinary Assistant Practice Test

(CVA) Certified Veterinary Assistant Practice Test

CVA Laboratory Sample Handling 4