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In the case of a simple lumpectomy blood may still be drawn from the upper extremity on that side of the body if there are no signs of Lymphedema.

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Lymphedema can be caused by surgery and/or by radiation threapy on certain parts of the body. Lymphedema causes fluid retention and tissue swelling usually in the arms/legs. This build up of fluid can have an effect on tests done on blood that is drawn from that affected area...

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A Lumpectomy is a surgical procedure that involves removing a suspected malignant tumor, or a benign lump or cyst, along with a small portion of the surrounding tissue leaving the breast for the most part fully intact..This procedure also leaves a vast majority of the lymphatic channels to the lymph nodes inside the breast and the lymphatic channels leading to the lymph nodes located in the arm pit intact so patients rarely develope Lymphedema from a simple lumpectomy unless radiation therapy is also performed as well.

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A Mastectomy is the complete surgical removal of the breast along with all the lymphatic channels and lymph nodes contained in the breast leaving only a layer of Skin and tissue covering the rib cage.The lymphatic "tail" leading from the breast to the lymph nodes under the arm pit is also removed to reduce the chance of cancer spreading to other parts of the body via the lymphatic system.

Most all Mastectomy patients develope some level of Lymphedema on that side of the body which will effect tests done on blood drawn from that area..

Because of this Blood should not be drawn from the side that a mastectomy has been performed unless there is no other alternative such as in cases were patients have had both of the breasts removed...

Blood pressure readings can also be effected by Lymphedema as well but those variations caused by it can be taken in to account by a well trained RN.

For more information please refer to the International Academy of Phlebotomy

Science website,American Breast Cancer Foundation or American cancer society as well....

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