Cancer

Diagnosis & Tests

Regular Screening Can Help You Stay Healthy

Early screening can find some cancers when they are small and easier to treat. A complete cure is possible for many early cancers. For older adults, decisions about screening should be based on overall health, life expectancy, ability to function, and personal choices — not age alone.

If you have had cancer before or have a family history of cancer, talk to your healthcare provider about whether you may need different or more frequent screening.

Screening is most helpful for people who:

  • Would want cancer treatment if cancer is found
  • Have a long enough life expectancy to benefit from finding a cancer early
  • Are healthy enough to have follow-up tests or treatment

Tests to Type and Stage Cancer

Once cancer is confirmed, more tests will be done to find the exact type and stage. Staging shows how much the cancer has grown and spread.

  • Biopsy of the tumor (removing a small piece of tissue)
  • Blood tests (to look for chemicals made by tumors)
  • Bone marrow biopsy (if testing for lymphoma or leukemia)
  • X-rays
  • Complete blood count (CBC)
  • Imaging tests such as CT (computed tomography) scan, MRI (magnetic resonance imaging), and ultrasound

These tests help guide treatment planning and follow-up.

When talking with your healthcare provider about your diagnosis, consider:

  • Bringing someone who can remind you to ask questions and help you remember what the doctor said
  • Writing down your questions before your visit
  • Taking notes during your visit


Last Reviewed and Updated: October 2026
By: AGS/HiAF Public Education Committee, HealthinAging.org Content Reviewers

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