[Campbell Biology P.337] What is the key difference between a screening test and a diagnosti... | Practice Question

What is the key difference between a screening test and a diagnostic test in fetal testing?

  • A: Screening tests are invasive, while diagnostic tests are noninvasive.
  • B: Screening tests suggest risk, while diagnostic tests provide a more definitive answer.
  • C: Screening tests are only for dominant disorders, and diagnostic tests are for recessive disorders.
  • D: Screening tests analyze fetal DNA, while diagnostic tests use ultrasound imaging.

Explanation

The text defines the relationship clearly: 'Screening tests are generally noninvasive and can be followed by diagnostic tests if screening results suggest that a genetic disorder might be present.' This shows that screening indicates a potential risk, which then warrants a more definitive and often invasive diagnostic test.