• Test

    Vitamin B12 level

    The vitamin B12 level is a blood test that measures how much vitamin B12 is in your blood. A blood sample is needed. You should not eat or drink for about 6 ...

  • Disease

    Von Willebrand disease

    Blood clots (fibrin clots) are the clumps that result when blood coagulates.

    Von Willebrand disease is the most common hereditary bleeding disorder. Von Willebrand disease is caused by a deficiency of von Willebrand factor. Von Willeb...