Galleri screens for a methylation “fingerprint” across many cancers from one draw. It is prescription-only, not FDA-cleared, and it does not replace mammograms or colonoscopy.
Health testing
Moderate evidence
Galleri
GRAIL multi-cancer blood test that looks for a cell-free DNA signal.
How to use
Ask a clinician. One blood draw. A positive signal needs diagnostic follow-up, not panic Googling.
Details
- Type of test
- Blood
- Provider
- GRAIL
- Turnaround time
- About 2 weeks after the lab receives the draw
- What it measures
- Cell-free DNA methylation patterns associated with 50+ cancers and a predicted origin.
- Scientific validity
- CLIA/CAP lab-developed test; not FDA-cleared. Use alongside standard screening.
Editorial rating ★ 4.0
The most serious consumer-adjacent cancer blood test. False positives still happen.
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