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Diagnostic Procedures & Interpretation Flashcards

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

Read the first 7 Diagnostic Procedures & Interpretation flashcards as text

  1. A physician orders a CBC. Which color-top tube is typically used for this test?

    Answer: Lavender

    Lavender-top tubes contain EDTA, which preserves cell morphology for hematology tests like the CBC.

  2. Which tube is used for a PT/INR to monitor warfarin therapy?

    Answer: Light blue top (sodium citrate)

    Coagulation studies such as PT/INR and PTT require a light blue-top tube containing sodium citrate.

  3. According to the standard order of draw, which specimen is collected first?

    Answer: Blood culture bottles

    Blood cultures are drawn first to keep the sterile sample from being contaminated.

  4. Which lab order most commonly requires the patient to fast for 9 to 12 hours beforehand?

    Answer: Lipid panel

    A fasting lipid panel needs 9-12 hours without food so triglyceride results are accurate.

  5. A gray-top tube, which contains sodium fluoride, is most often used for which test?

    Answer: Blood glucose

    Sodium fluoride stops glycolysis, so glucose levels in the sample stay stable.

  6. A lab order is written as STAT. What does this mean for the HUC?

    Answer: Process immediately

    STAT orders are top priority and must be processed and communicated immediately.

  7. When is a trough drug level usually drawn?

    Answer: Just before the next scheduled dose

    A trough level shows the lowest drug concentration, so it is drawn just before the next dose.

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