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The Galleri Test: What a Multi-Cancer Blood Test Can and Can’t Tell You
Most cancer screening checks for one cancer at a time: a Pap smear for the cervix, a mammogram for the breast. The Galleri test takes a different approach. Developed by GRAIL, it is a multi-cancer early detection blood test that looks for signals from more than 50 types of cancer in a single draw, including several that have no standard screening test. Dr. Alex Tepper, a board-certified OB/GYN and FACOG on Manhattan’s Upper East Side, offers Galleri testing as part of his preventive care and clearly explains its limits as well as its benefits.
What the Galleri Test Is and How It Works
The Galleri test is a liquid biopsy that analyzes cell-free DNA shed into the bloodstream by cells throughout the body. When cells, including potentially cancerous ones, break down, they release fragments of DNA carrying chemical “signatures” called methylation patterns. The Galleri test reads these patterns and uses machine learning to determine whether they resemble cancer-associated patterns and, if so, which tissue or organ the signal may come from.
A single blood draw is all that is required. Results are typically returned within about two weeks and fall into one of two categories: a cancer signal not detected result, or a cancer signal detected result that also indicates one or two possible tissue types of origin. The Galleri test is not a diagnostic test. A positive result does not confirm a cancer diagnosis; it identifies a signal that warrants further evaluation by your physician. Likewise, a negative result does not guarantee the absence of cancer.
Which Cancers May Be Detected
The Galleri test is designed to screen for more than 50 cancer types, many of which have no standard recommended screening, including cancers of the ovary, pancreas, liver, esophagus and stomach, as well as several blood cancers. Published data show it detects later-stage cancers more reliably than early-stage ones, and research on early-stage sensitivity is ongoing.
How It Fits Into a Preventive Care Visit
At Dr. Tepper’s practice, the Galleri test is incorporated into the broader conversation about gynecologic and preventive health, alongside annual well-woman exams, Pap smears, hereditary cancer screening, and other established screening tools. It complements, rather than replaces, existing guidelines.
Where Galleri Stops: The Limits Worth Knowing
Anyone considering Galleri should understand what the test cannot do as well as what it can. Dr. Tepper has this conversation with every patient who asks about it. The Galleri test does not replace standard cancer screenings. Mammograms, Pap smears, colonoscopies, and low-dose CT scans for lung cancer remain the recommended tools for the cancers they are designed to detect. The Galleri test is intended to complement these screenings, not substitute for them. Patients who receive a cancer signal detected result will need follow-up imaging or other diagnostic workup; the test itself cannot confirm a cancer diagnosis, stage a cancer, or identify a tumor’s precise location.
Sensitivity and Specificity Vary by Cancer Type
The test’s ability to detect a cancer signal varies by cancer type and by stage. For some cancers, stage I sensitivity may be relatively low, meaning the test could return a negative result even if early-stage disease is present. The false positive rate, meaning a signal-detected result in a person without cancer, is reported to be low but is not zero. These are important factors to weigh with your physician.
Who the Test Is Intended For
The Galleri test is intended for adults aged 50 and older as a complement to standard screening. Some individuals with elevated hereditary cancer risk, which can be assessed through hereditary cancer screening offered at Dr. Tepper’s practice, may discuss earlier testing with their physician. As with all medical decisions, candidacy depends on an individual’s personal and family history, and a conversation with a qualified provider is the right starting point.
Dr. Tepper’s commitment to evidence-based medicine means he will walk you through the published data honestly, so you can decide whether the Galleri test fits your personal risk profile and peace of mind.
Adding the Galleri Test to Your Annual Preventive Care in New York
Galleri is most useful as one part of a coordinated preventive plan. As a solo practitioner, Dr. Tepper sees every patient himself, so the physician who already knows your history reviews your results, rather than someone reading your chart for the first time.
Incorporating the Galleri test into your annual well-woman visit creates an opportunity to review all screening recommendations together: Pap smear intervals, mammography timing, hereditary risk factors, and now multi-cancer blood-based screening. This integrated approach is the standard Dr. Tepper holds himself to, and it reflects the personalized attention patients on the Pap smear and cervical cancer screening pathway have come to expect from his practice.
The practice accepts most major commercial insurance plans. Galleri itself is not yet covered by most insurers and is typically an out-of-pocket cost, so ask about current pricing when you book. You can also explore additional health and wellness topics relevant to women’s preventive care on the Dr. Alex Tepper OBGYN blog, which covers a range of obstetric and gynecologic subjects for patients at every stage of life.
One Physician Reviewing Every Result
Dr. Alex Tepper has been a solo practitioner on Manhattan’s Upper East Side since 2000. As a board-certified OB/GYN and Fellow of the American College of Obstetricians and Gynecologists (FACOG), he brings more than 20 years of clinical experience to every preventive care conversation. When you come to his practice for the Galleri test, you will see Dr. Tepper himself, every visit, without exception. There are no covering residents and no rotating physicians.
His practice maintains dual hospital privileges at Mount Sinai Medical Center and Lenox Hill Hospital, reflecting a level of credentialing rarely found in a solo practice. Dr. Tepper is also fluent in Spanish and actively serves the Latin American community across New York, offering a genuinely bilingual environment for patients who prefer to discuss sensitive health topics in Spanish. Appointments are spaced so that wait times never exceed 15 minutes, and Dr. Tepper is personally available to his patients 24 hours a day, 7 days a week. For discerning New York patients who want a physician who truly knows them, his concierge medicine approach provides that relationship from the very first visit.
Questions Patients Ask Before Ordering Galleri
Is the Galleri test covered by insurance in New York?
Most commercial plans do not yet cover the Galleri test, so it is usually an out-of-pocket expense. Coverage policies are changing as research on multi-cancer early detection grows, and Dr. Tepper’s team can share current pricing at your consultation.
How is the Galleri test different from a standard blood panel or tumor marker test?
A standard blood panel measures metabolic markers, cholesterol, or organ function. Traditional tumor marker tests, such as CA-125, measure proteins that may be elevated in certain cancers but are also elevated in benign conditions. The Galleri test analyzes methylation patterns in cell-free DNA to identify cancer-associated signals across more than 50 cancer types from a single draw, making it a distinct category of cancer screening technology with a different mechanism and application.
Who is a good candidate for the Galleri test?
The Galleri test is currently intended for adults aged 50 and older who wish to add multi-cancer screening to their existing preventive care. Individuals with a significant family history of cancer or known hereditary risk factors may discuss testing earlier with their physician. Dr. Tepper will determine candidacy during a one-on-one conversation, reviewing your personal and family history, current screening regimen, and health goals to help you make an informed decision.
Does a negative Galleri test result mean I am cancer-free?
No. A negative result, reported as “cancer signal not detected,” means the test did not find a cancer-associated methylation pattern in that sample. It does not rule out cancer, especially at very early stages when the signal may be too faint to detect, and it should never replace recommended screenings such as mammograms or Pap smears.
Can I get the Galleri test as part of my annual well-woman exam at Dr. Tepper’s practice?
Yes. Dr. Tepper offers Galleri as a complement to the annual gynecologic and preventive visit, which lets him review your full screening picture at once, including Pap smear status and hereditary cancer risk. Mention it when you request your appointment.
Talk Through Your Screening Plan With Dr. Tepper
If you are wondering whether a multi-cancer blood test makes sense for you, start with a conversation. Dr. Tepper will review your personal and family history, explain what Galleri can and cannot add, and help you decide; book online today.
About Me
Dr. Alex Tepper is a board-certified OB/GYN who has served women on the Upper East Side of Manhattan for over 20 years, providing personalized care with all deliveries at The Mount Sinai Medical Center. He is joined by Dr. Gabriella Tepper, DNP, CNM, a Columbia University–trained certified nurse-midwife who supports women through every stage of life with a compassionate, patient-centered approach. Together, they combine experience, accessibility, and individualized care to support women’s health at every phase.
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