Newly Diagnosed With Breast Cancer: What Hereditary Genetic Testing Means for You
Genetic testing is often recommended after a breast cancer diagnosis. This page explains why, what it can tell you, and what usually happens in the process.
What You Need to Know Right Now
- Hereditary genetic testing is commonly recommended after a breast cancer diagnosis — not just for future prevention, but because results can inform decisions about surgery and treatment that may be happening now.
- The most relevant genes are BRCA1, BRCA2, PALB2, CHEK2, and ATM. A positive result in any of these can affect the surgical approach your medical team discusses with you.
- Testing typically takes one to two weeks. If you have a surgery decision coming up, a genetic counselor can often expedite the process.
- A negative result is also informative — it can rule out hereditary causes and provide clarity about your family’s risk.
What Hereditary Testing Means When You Have a Breast Cancer Diagnosis
Most breast cancers are not hereditary — they occur due to acquired mutations, not inherited ones. However, approximately 5-10% of breast cancers are linked to an inherited gene mutation. Testing at the time of diagnosis determines whether your cancer falls into this category.
If a hereditary mutation is identified, it provides information beyond your own situation — it signals that first-degree relatives may carry the same mutation and may benefit from increased screening or risk-reduction conversations.
What Usually Happens Next
After a breast cancer diagnosis, genetic testing is often ordered quickly because results can influence surgical planning. Some patients choose to delay until after initial treatment. A genetic counselor will help you understand the timeline that makes sense for your situation.
If a mutation is found, your oncology team and genetic counselor will discuss what it means for your treatment plan and what screening is recommended for relatives.
How Hereditary Testing Can Affect Surgical and Family-Risk Discussions
Surgical decisions
If a BRCA1, BRCA2, or other high-risk mutation is identified, some patients and their surgical teams discuss bilateral mastectomy versus lumpectomy. This is a personal decision — the genetic counselor’s role is to ensure you have the information to make it, not to recommend a specific approach.
Ovarian cancer risk
BRCA1 and BRCA2 mutations also raise ovarian cancer risk. A positive result may prompt a conversation with your gynecologic oncologist about surveillance or risk-reduction options — separate from your breast cancer treatment.
Informing your family
A hereditary mutation found during your treatment is important information for your first-degree relatives. Your genetic counselor can help you think through how to share this in a way that is clear and useful without being overwhelming.
If testing was already done and was negative
A previous negative result does not rule out all hereditary causes — panel testing has expanded significantly over the years. If your previous test was a BRCA-only test or an older panel, updated testing may be worth discussing.
What Your Diagnosis May Mean for Your Family
If a hereditary mutation is identified, each of your first-degree relatives — parents, siblings, and children — has approximately a 50% chance of carrying the same mutation. They can be tested to find out their own status.
Even if no mutation is found, your diagnosis may prompt relatives to speak with a genetic counselor about their own family history, particularly if other relatives have had breast or ovarian cancer.
- First-degree relatives (parents, siblings, children) — 50% chance if mutation identified
- Your children can be tested as adults when they are ready to act on the information
- Sisters are often prioritized for cascade testing given shared breast and ovarian cancer risk
How LifeShield Can Help
Expedited genetic counseling
If your surgery timeline is pressing, LifeShield can often coordinate testing on an accelerated basis
Multi-gene hereditary panel
Covers BRCA1, BRCA2, PALB2, CHEK2, ATM, and all clinically significant hereditary breast cancer genes
Results coordination
Results review timed to your clinical situation, with a summary you can share with your oncology team
Family cascade support
Guidance for relatives who want to understand their own risk after your result
Reviewed by LifeShield Medical Team · Last reviewed March 2026
Frequently Asked Questions
NCCN guidelines recommend genetic counseling and testing for many patients with a breast cancer diagnosis, particularly those diagnosed before age 50, those with triple-negative breast cancer, those with a family history of breast or ovarian cancer, and those of Ashkenazi Jewish ancestry. A genetic counselor will review whether testing is indicated for your specific situation.
Yes, in some cases. If a BRCA1 or BRCA2 mutation is identified, it may be relevant to discussions about surgical options, targeted therapies (PARP inhibitors), and ovarian cancer risk management. Your oncology team will advise on the clinical implications for your specific case.
Most results are returned within one to two weeks. If you have an upcoming surgery decision, let your genetic counselor know — in some cases testing can be expedited.
Genetic testing panels have expanded significantly. If your previous test was a BRCA-only test, or if it was performed before 2015, updated testing may identify mutations that were not included in older panels. A genetic counselor can review your previous results.
Most eligible patients qualify for coverage when NCCN criteria are met. A breast cancer diagnosis often meets those criteria. LifeShield provides insurance support and superbill assistance for all patients.
Ready to Take the Next Step?
When you are ready, a licensed genetic counselor can help you understand your options and build a clear plan.
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. It is based on published NCCN clinical guidelines and peer-reviewed research. Always consult a qualified healthcare provider for medical decisions. LifeShield content is reviewed by board-certified genetic counselors.