What is BRCA Gene Test? Purpose, Levels/Procedure & Result

A BRCA gene test is a blood test that checks for changes in your BRCA1 and BRCA2 genes. These genes normally help protect you from breast and ovarian cancers by repairing damaged DNA in your cells.

When these genes have harmful changes (called mutations), they can't do their protective job properly. This means your risk of developing certain cancers becomes higher than average. The test helps you and your doctor understand your personal cancer risk so you can make informed decisions about your health.

What is BRCA gene testing?

BRCA gene testing looks for specific changes in two important genes called BRCA1 and BRCA2. Think of these genes as your body's natural repair crew for damaged DNA.

Everyone has these genes, and they work around the clock to fix small DNA problems that happen naturally in your cells. When they function normally, they significantly reduce your cancer risk. However, when these genes have harmful mutations, they can't perform their protective duties effectively.

The test involves taking a small blood sample from your arm. In some cases, your doctor might collect saliva instead. The sample goes to a specialized laboratory where scientists examine your DNA sequence to look for known harmful changes.

Why is BRCA gene testing done?

BRCA testing helps identify people who have inherited a higher risk of developing breast, ovarian, and several other cancers. Your doctor might recommend this test if cancer runs in your family or if you have certain personal risk factors.

The information from this test can guide important health decisions. If you test positive for a harmful mutation, you and your healthcare team can create a personalized plan for cancer prevention and early detection. This might include more frequent screening, preventive medications, or even preventive surgeries.

Testing can also provide valuable information for your family members. Since these mutations are inherited, your results might prompt relatives to consider testing as well. This family-wide approach can help protect multiple generations.

What is the procedure for BRCA gene testing?

The BRCA gene testing procedure is straightforward and typically takes just a few minutes. Your healthcare provider will draw a small amount of blood from a vein in your arm, similar to routine blood work.

Before the test, you'll meet with a genetic counselor who will review your family history and explain what the results might mean. This counseling session is crucial because it helps you understand the implications of testing and prepares you for different possible outcomes.

Here's what you can expect during the testing process:

1. Pre-test genetic counseling session to discuss your family history and risk factors
2. Blood draw or saliva collection at a medical facility
3. Laboratory analysis of your DNA, which typically takes 2-4 weeks
4. Results discussion with your genetic counselor and healthcare provider
5. Post-test counseling to explain results and discuss next steps

The entire process emphasizes support and education. Your healthcare team wants to ensure you feel informed and comfortable throughout your testing journey.

How to prepare for your BRCA gene test?

Preparing for BRCA gene testing involves gathering information about your family's health history rather than physical preparation. You don't need to fast or avoid any foods or medications before the test.

The most important preparation is collecting detailed information about cancer diagnoses in your family. This includes both sides of your family tree, going back at least three generations if possible. Your genetic counselor will use this information to assess whether testing is appropriate for you.

Here's what information you should gather before your appointment:

• Types of cancers diagnosed in family members
• Ages when family members were diagnosed with cancer
• Whether any relatives have had genetic testing
• Information about relatives from both your mother's and father's sides
• Any known genetic mutations in your family

Consider bringing a trusted family member or friend to your counseling appointments. Having emotional support can help you process the information and make decisions that feel right for you.

How to read your BRCA gene test results?

BRCA gene test results fall into three main categories: positive, negative, or variant of uncertain significance. Your genetic counselor will explain exactly what your specific results mean for your health.

A positive result means you have a harmful mutation in either BRCA1 or BRCA2. This significantly increases your risk of developing breast, ovarian, and several other cancers during your lifetime. However, having a mutation doesn't guarantee you'll develop cancer.

A negative result typically means no harmful BRCA mutations were found. If you have a strong family history of cancer, this might mean your family's cancer risk comes from other genetic factors or environmental causes that aren't related to BRCA genes.

A variant of uncertain significance means the test found a genetic change, but scientists aren't sure whether it increases cancer risk. This result requires careful monitoring as more research becomes available to clarify the variant's significance.

What is the best BRCA gene test result?

The best BRCA gene test result is a true negative, meaning no harmful mutations were detected and your family doesn't have a history of BRCA-related cancers. This result suggests your cancer risk is similar to the general population.

However, every result provides valuable information that can guide your healthcare decisions. Even a positive result, while concerning, empowers you with knowledge to take proactive steps for your health. Many people with BRCA mutations never develop cancer, especially when they follow recommended screening and prevention strategies.

What matters most is how you use your results to make informed decisions about your health. Whether positive or negative, your results become a tool for creating a personalized healthcare plan that fits your specific situation and preferences.

What are the risk factors for BRCA gene mutations?

BRCA gene mutations are inherited conditions, so your primary risk factor is having a family history of these mutations. You inherit one copy of each BRCA gene from each parent, and a mutation in either copy can increase your cancer risk.

Certain ethnic backgrounds have higher rates of BRCA mutations. People of Ashkenazi Jewish descent have about a 1 in 40 chance of carrying a BRCA mutation, compared to about 1 in 500 in the general population. This increased frequency is due to founder effects in these populations.

Several family history patterns suggest increased likelihood of BRCA mutations:

• Multiple family members with breast or ovarian cancer
• Breast cancer diagnosed before age 50
• Ovarian cancer at any age
• Male breast cancer
• Triple-negative breast cancer
• Breast cancer in both breasts
• Both breast and ovarian cancer in the same person

Having these risk factors doesn't mean you definitely have a BRCA mutation. Many people with strong family histories test negative, while others with limited family history test positive.

What are the possible complications of BRCA gene mutations?

BRCA gene mutations significantly increase your risk of developing several types of cancer, with breast and ovarian cancers being the most common. The exact risk varies depending on which gene is affected and other personal factors.

Women with BRCA1 mutations have about a 55-72% lifetime risk of breast cancer and a 39-44% risk of ovarian cancer. Those with BRCA2 mutations face about a 45-69% breast cancer risk and an 11-17% ovarian cancer risk. These numbers are much higher than the general population risks.

Beyond breast and ovarian cancers, BRCA mutations can increase risk for other cancers:

• Pancreatic cancer (especially with BRCA2 mutations)
• Prostate cancer in men
• Male breast cancer
• Melanoma
• Fallopian tube cancer
• Primary peritoneal cancer

These cancers associated with BRCA mutations often occur at younger ages than typical. They may also be more aggressive or have different characteristics than cancers that develop in people without these mutations.

When should I see a doctor for BRCA gene testing?

You should consider discussing BRCA gene testing with your doctor if you have a personal or family history that suggests increased cancer risk. The decision to test is personal and depends on various factors including your family history, age, and personal preferences.

Your doctor might recommend genetic counseling if you have specific risk factors. This doesn't mean you must get tested, but it helps you understand whether testing might be beneficial for you and your family.

Consider scheduling a consultation if you have any of these situations:

• Multiple relatives with breast or ovarian cancer
• Cancer diagnosed at unusually young ages in your family
• A known BRCA mutation in your family
• Male relatives with breast cancer
• Relatives with both breast and ovarian cancer
• Ashkenazi Jewish ancestry with any family history of breast or ovarian cancer

Even if you don't meet standard criteria for testing, discussing your concerns with a healthcare provider can help you understand your personal risk and screening options.