The term "Blood" in Chinese Medicine references circulation and also the production, containment, and overall health of what we usually think of as blood. When an acupuncturist considers the health of the blood we look for signs of poor micro-circulation (think capillaries) such as cold hands and feet. Usually there are some co-current symptoms such as headaches, and in women, a difficult menstrual cycle.
As this concept is quite different in Western medicine, suggested therapies may be quite different. The biggest difference is that in Western medicine we usually keep discussions of blood to our conversations about cardio-vascular and heart health. In Chinese medicine we also consider the blood when discussing Women's Health.