Galleri Multi-Cancer Early Detection Test: Cost, Accuracy & the Honest Limits

What it is

How Galleri Works

Tumors shed small fragments of DNA into the bloodstream. Galleri sequences those cell-free DNA fragments and reads their methylation patterns — a chemical signature that often identifies whether a cancer signal is present and which tissue it likely came from.

It's a single blood draw. Results in about 10 business days. Reported as 'Cancer Signal Detected' (with a predicted tissue of origin) or 'Cancer Signal Not Detected.'

Galleri is not FDA-approved. It's offered under CLIA as a laboratory-developed test, prescribed by a physician.

The accuracy story

Sensitivity, Specificity, and What That Actually Means

Specificity in PATHFINDER and CCGA studies was about 99.5% — meaning roughly 1 in 200 healthy adults will get a false positive that triggers workup.

Overall sensitivity was about 29% across all cancers and stages. That number rises sharply with stage: roughly 17% sensitivity for Stage I, 40% for Stage II, 77% for Stage III, and 95% for Stage IV.

Cancer-type matters enormously. Sensitivity is strong for pancreatic, ovarian, esophageal, liver, and head/neck cancers — exactly the cancers without effective routine screening. It is weaker for prostate and many early breast cancers, where existing screening (PSA, mammography) already works.

Tissue-of-origin prediction was correct in 88% of true positives in CCGA — useful for directing diagnostic workup.

Honest framing

The Honest Read for Patients

Galleri does not replace colonoscopy, mammography, low-dose chest CT for eligible smokers, cervical cancer screening, or PSA discussions. A 'Cancer Signal Not Detected' result does not mean cancer-free.

Where it adds the most value: a 50-to-75-year-old who is fully up to date on standard screening and wants additional surveillance for the high-mortality cancers (pancreatic, ovarian, liver) that have no standard screening test.

Where it adds the least: a 30-year-old with no risk factors. Pre-test probability is so low that even a true-positive is rare and any positive is more likely false.

Cost

What Galleri Costs and Who Pays

Cash price: $949 per test (June 2026). Some longevity clinics bundle it into annual membership.

Insurance generally does not cover Galleri for screening; coverage in symptomatic workup remains limited.

Medicare coverage has been proposed in pending legislation but is not in place as a routine benefit.

Pricing reviewed June 2026.

What happens after a positive

If Your Result Comes Back Positive

A 'Cancer Signal Detected' result triggers diagnostic workup directed by the predicted tissue of origin — typically targeted imaging (MRI, CT, endoscopy) and sometimes biopsy.

False positives do happen and can lead to substantial downstream testing, anxiety, and cost. This is the principal trade-off of expanded screening and is the reason the test is best used in patients with an informed understanding of that risk.