Why is it advised to avoid drawing blood from the side of a patient who has had a mastectomy?

Avoiding blood draws from the side of a patient who has had a mastectomy is particularly important due to the possibility of lymphostasis on that side. After a mastectomy, especially if lymph nodes have been removed, the pathway for lymphatic drainage can be disrupted. This condition can lead to swelling and increased risk of lymphedema, where fluid builds up due to improper drainage.

Drawing blood from that side can exacerbate these conditions, as it may further compromise lymphatic function and increase the risk of complications. Additionally, there may be scarring and sensitivity in that area which can lead to patient discomfort if blood is drawn.

While the other factors, such as increased risk of infection or pain, may be considerations, the primary concern linked directly to the surgical alteration and potential for lymphatic complications is the possibility of lymphostasis. This underscores the importance of understanding anatomy and the effects of surgical procedures when caring for patients.