what is a brca test
Breast Cancer (BRCA) Gene Test. Guide. A breast cancer (BRCA) gene test is a blood test to check for specific changes (mutations) in genes that help control normal cell growth.Finding changes in these genes, called BRCA1 and BRCA2, can help determine your chance of developing breast cancer and ovarian cancer.reast Cancer (BRCA) Gene Test. Guide. A breast cancer (BRCA) gene test is a blood test to check for specific changes (mutations) in genes that help control normal cell growth.