Blood is the fluid in the circulatory system that carries oxygen, food, and waste products. The blood fluid consists of plasma, red blood cells, white blood cells, and platelets. Red blood cell disorders include anemia (too few) and polycythemia (too many). White blood cells are part of the immune system, with disorders including low white cells, raised white blood cells, and many others. Platelets are related to blood clotting and disorders may involve poor clotting or excessive clot formation (e.g. clotting disorders; embolism; DVT). Read more about: Blood disorders, Red blood cell disorders, White blood cell disorders

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Your blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.

Red blood cells (RBC) deliver oxygen from your lungs to your tissues and organs. White blood cells (WBC) fight infection and are part of your immune system. Platelets help blood to clot when you have a cut or wound. Bone marrow, the spongy material inside your bones, makes new blood cells. Blood cells constantly die and your body makes new ones. Red blood cells live about 120 days, and platelets live about 6 days. Some white blood cells live less than a day, but others live much longer.

There are four blood types: A, B, AB, or O. Also, blood is either Rh-positive or Rh-negative. So if you have type A blood, it's either A positive or A negative. Which type you are is important if you need a blood transfusion. And your Rh factor could be important if you become pregnant - an incompatibility between your type and the baby's could create problems.

Blood tests such as blood count tests help doctors check for certain diseases and conditions. They also help check the function of your organs and show how well treatments are working. Problems with your blood may include bleeding disorders, excessive clotting and platelet disorders. If you lose too much blood, you may need a transfusion.

NIH: National Heart, Lung, and Blood Institute

Source: MedLinePlus (NIH)1

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Blood: The body fluid that circulates in the vascular system (Blood Vessels). Whole blood includes Plasma and Blood Cells.2


Types may include:3

Types of Plasma:

  • Platelet-poor Plasma
  • Platelet-rich Plasma

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  1. Source: MedLinePlus (NIH): blood.html
  2. Source: MeSH (U.S. National Library of Medicine)
  3. Source: NCI Thesaurus
  4. Source: OWH (DHHS): heart-disease-and-stroke/ heart-disease/ heart-disease-risk-factors/ health-conditions

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.