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Core Concepts and Principles Flashcards

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

Read the first 7 Core Concepts and Principles flashcards as text

  1. Repeated measurements of the same sample give nearly identical results that are all far from the true value. The method is:

    Answer: Precise but not accurate

    Precision is agreement between replicates, while accuracy is closeness to the true value.

  2. What is the normality of a 1 M sulfuric acid (H2SO4) solution?

    Answer: 2 N

    H2SO4 donates two hydrogen ions per molecule, so N = M × 2 = 2 N.

  3. If disease prevalence in the tested population increases while sensitivity and specificity stay constant, the positive predictive value will:

    Answer: Increase

    Higher prevalence means a larger share of positive results are true positives, which raises PPV.

  4. Which federal agency administers the CLIA program that certifies clinical laboratories in the United States?

    Answer: CMS

    CMS handles CLIA certification, fees, and enforcement, while FDA categorizes test complexity and CDC provides technical support.

  5. Under standard precautions, which body fluids are treated as potentially infectious?

    Answer: All blood and body fluids from every patient

    Standard precautions assume every patient's blood and body fluids may carry bloodborne pathogens.

  6. On an NFPA 704 hazard diamond, the blue section indicates:

    Answer: Health hazard

    Blue is health, red is flammability, yellow is reactivity, and white is special hazards.

  7. In a spectrophotometer, which component isolates the specific wavelength of light directed through the sample?

    Answer: Monochromator

    A monochromator, such as a prism, diffraction grating, or filter, selects a narrow band of wavelengths.