With the patient's consent, a health professional will take 20ml (4 teaspoons) of blood to carry out extensive testing on genes associated with breast cancer. In general, there are minimal if any side effects from this procedure; occasionally there may be some small pain or discomfort, and a small bruise may form. The blood will be stored in a central testing laboratory where genetic material (DNA) will be extracted for genetic testing for a BRCA1 or BRCA2 genetic fault.
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