A diagnostic is a test that is used to understand the reason behind a patient’s symptoms or illness to make a diagnosis.
Diagnostics can be either invasive or non-invasive. Invasive diagnostics, such as a blood sample or biopsy, involve puncturing the skin or entering the body. Otherwise, diagnostics are known as non-invasive. Common examples of non-invasive diagnostics include eye exams, radiology scans, and routine physicals.
Some diagnostics such as COVID-19 rapid tests or pregnancy tests can be done from home or in community settings. More intensive diagnostics, such as blood tests or colonoscopies, are performed in a doctor’s office or a laboratory.