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Ct and Cq Values

This Medical Laboratory Science lesson in Molecular Diagnostics supports laboratory science learning and laboratory interpretation for medical laboratory students and professionals.

Explain cycle threshold (Ct) / quantification cycle (Cq) as assay-dependent readouts, not universal cutoffs or automatic markers of infectiousness or disease severity.

Intermediate9 min read15 sectionsMolecular Diagnostics
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Learning Objectives

Getting started

Section 1 of 15

Learning Objectives

Learning Objectives

Section: Learning Objectives

Each objective is a clinical PCR skill for medical laboratory scientists, not advanced biochemistry.

  • Define Ct (cycle threshold) and Cq (quantification cycle) in practical laboratory terms
  • Explain why Ct/Cq meaning is assay-dependent and must not be treated as a universal cutoff
  • Reject the idea that a lower Ct always equals greater infectiousness or disease severity

Section 1 of 15