What is one characteristic of first-line (initial) testing?

The characteristic that best describes first-line (initial) testing is that it is typically associated with lower image quality and is often non-therapeutic. First-line tests are usually performed as preliminary assessments to diagnose or rule out conditions with a focus on being cost-effective and less invasive. These tests serve as a starting point in the diagnostic process, allowing healthcare providers to gather essential information without subjecting the patient to more complex, costly, or invasive procedures initially.

First-line tests are designed to provide adequate information to guide further testing or treatment plans, but they may not yield the high-resolution results characteristic of more advanced, second-line diagnostic procedures. Their non-therapeutic nature reflects their purpose in establishing the need for additional, more specific interventions rather than treating the problem directly.