Diagnostic imaging includes X-ray, ultrasound, DEXA, CT, MRI, and nuclear studies. The right scan answers a defined question or follows a validated screening guideline while minimizing radiation, contrast, incidental findings, and unnecessary follow-up.
Diagnostic scans create anatomical or functional information using different technologies. A scan is valuable when it has an appropriate indication and a plan for acting on results—not because more imaging is inherently preventive.
Major modalities
Screening is not diagnosis
Screening asymptomatic people only helps when evidence shows benefits exceed harms in a defined group. FDA knows of no evidence that full-body CT screening of asymptomatic people provides more benefit than harm. Whole-body MRI avoids radiation but still creates incidental findings, follow-up, anxiety, cost, and uncertain outcome benefit.
Incidental findings
High-resolution imaging often finds cysts, nodules, degenerative changes, or variants that were not causing disease. Some need surveillance or biopsy; many do not. Before scanning, know who reads it, what protocol is used, and who owns follow-up.
Right test, right dose, right time
Use appropriateness criteria, prior imaging, age, pregnancy, kidney function, implants, contrast history, and the clinical question. A normal broad scan does not replace mammography, cervical, colorectal, lung, or other guideline-based screening.
Provide pregnancy status, kidney disease, implants and devices, metal exposure, contrast or allergy history, claustrophobia, medications, prior imaging, and the exact clinical question. Follow fasting or hydration instructions specific to the scan.
Most noninvasive scans need no recovery. After contrast or sedation, follow facility instructions. Seek care for allergic symptoms, severe pain or swelling at an IV site, breathing difficulty, or concerning sedation effects.
Ionizing radiation, contrast allergy or kidney concerns, gadolinium considerations, sedation complications, claustrophobia, false positives and negatives, incidental findings, overdiagnosis, unnecessary biopsy or surgery, and false reassurance.
FDA: Computed Tomography.
https://www.fda.gov/radiation-emitting-products/medical-x-ray-imaging/computed-tomography-ctACR Appropriateness Criteria.
https://www.acr.org/Clinical-Resources/Clinical-Tools-and-Reference/Appropriateness-Criteria© 2026 Longevity Clinic Finder. All rights reserved.
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Only as indicated by symptoms, validated screening guidance, or a documented surveillance plan. Avoid automatic annual full-body imaging.
People with a defined diagnostic question or who meet evidence-based screening criteria and have a clear pathway for follow-up.
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