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glossary

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  • Hematocrit

    (hee-MA-toh-krit)

    The amount of whole blood that is made up of red blood cells. It depends on the number and size of red blood cells. A hematocrit test is usually part of a complete blood count (CBC). It may be used to check for conditions such as anemia, dehydration, malnutrition, and leukemia. Also called HCT.

  • Hematologist

    HEE-muh-TAH-loh-jist

    A doctor who has special training in diagnosing and treating blood disorders.

  • Hematology

    A medical science that deals with the blood and blood-forming organs.

  • Hematology/oncology

    The branch of medical science that treats disorders of the blood, blood forming tissues and tumor cells.

  • Hematoma

    (HEE-muh-TOH-muh)

    A pool of mostly clotted blood that forms in an organ, tissue, or body space. A hematoma is usually caused by a broken blood vessel that was damaged by surgery or an injury. It can occur anywhere in the body, including the brain. Most hematomas are small and go away on their own, but some may need to be removed by surgery.

  • Hematuria

    (HEE-muh-TOOR-ee-uh)

    Blood in the urine; urine may be pink, red, or brown (coke colored).

  • Hemoglobin

    HEE-moh-GLOH-bin

    A protein inside red blood cells that carries oxygen from the lungs to tissues and organs in the body and carries carbon dioxide back to the lungs. Testing for the amount of hemoglobin in the blood is usually part of a complete blood cell (CBC) test.

  • Hemolysis

    (hee-MAH-lih-sis)

    The breakdown of red blood cells. Some diseases, medicines, and toxins may cause red blood cells to break down more quickly than usual.

  • Hemorrhage

    (HEH-muh-rij)

    In medicine, loss of blood from damaged blood vessels. A hemorrhage may be internal or external, and usually involves a lot of bleeding in a short time.

  • Hemorrhagic cystitis

    (HEH-muh-RA-jik sis-TY-tis)

    A condition in which the lining of the bladder becomes inflamed and starts to bleed. The blood can be seen in the urine. Symptoms include pain and a burning feeling while urinating, feeling a need to urinate often, and being unable to control the flow of urine. Hemorrhagic cystitis may be caused by anticancer drugs, radiation therapy, infection, or being exposed to chemicals, such as dyes or insecticides.