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Laboratory Procedures Flashcards

7 cards from real VTNE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Laboratory Procedures flashcards as text

  1. What is the most likely interpretation if a blood sample shows marked lipemia on a serum chemistry panel?

    Answer: Post-prandial state or hyperlipidemia disorder

    Lipemia (milky appearance) in serum is most commonly caused by post-prandial triglyceride elevation or a primary hyperlipidemia disorder, and can interfere with multiple chemistry analytes.

  2. When using an automated cell counter, which parameter is most commonly falsely elevated by platelet clumping?

    Answer: White blood cell count

    Platelet clumps are counted as white blood cells by impedance-based analyzers because their combined size falls within the WBC detection threshold, falsely elevating the WBC count.

  3. A cat has a PCV of 18% and the plasma appears icteric. Which additional test is most appropriate next?

    Answer: Direct and total bilirubin

    Icteric plasma with anemia warrants measurement of bilirubin fractions to differentiate prehepatic (hemolytic), hepatic, and posthepatic causes of icterus.

  4. Which organism is identified by a positive Voges-Proskauer (VP) test in bacteriology?

    Answer: Klebsiella pneumoniae

    Klebsiella pneumoniae produces acetoin (detected by the VP test), whereas E. coli is VP-negative — a key distinction between these Enterobacteriaceae.

  5. The PIVKA test (Proteins Induced by Vitamin K Absence or Antagonism) is used to diagnose:

    Answer: Rodenticide anticoagulant toxicosis

    PIVKA (also called Thrombotest or Normotest) detects inactive clotting factors caused by vitamin K deficiency or antagonism, as seen with anticoagulant rodenticide ingestion.

  6. On cytology, which cell type is predominant in a well-differentiated mast cell tumor aspirate?

    Answer: Round cells with purple granules and a central nucleus

    Mast cells are round cells characterized by abundant purple (metachromatic) cytoplasmic granules surrounding a central to eccentric nucleus on Romanowsky-stained preparations.

  7. Which fecal egg flotation solution has the highest specific gravity and is best for recovering heavy parasite eggs such as Taenia spp.?

    Answer: Sugar (Sheather's) solution (SG 1.27)

    Sheather's sugar solution has a specific gravity of approximately 1.27, making it capable of floating heavier eggs including tapeworm eggs that may sink in lower SG solutions.