Nine more people — all women — have developed rare blood clotting after getting J&J's shot, bringing the total to 15 cases. Three cases were fatal.

A white blood cell count is considered high when white blood cell levels exceed 11,000 per microliter (μL) of blood. When to See a Healthcare Provider .

Low White Blood Count: Learn more about low white blood cell counts, what's "normal," what low WBC could mean, and what you can do about it.

Dr. Soma Mandal, a board-certified internist at Summit Health in New Providence, New Jersey, says that getting a CBC test is ...

A complete blood count (CBC) measures red and white blood cells as well as platelets. It can help identify infections, ... 15 science-based ways to reduce your risk of dementia.

A healthy platelet count is 150,000 to 450,000 platelets per microliter of blood. Any platelet count below 150,000 is thrombocytopenia, but mild thrombocytopenia doesn’t typically need to be ...

Leukemia can have vague symptoms, or none at all, so it’s often detected through routine blood work. Learn how blood cell counts help detect leukemia and guide treatment.

An MCHC blood test measures the amount of hemoglobin a red blood cell has relative to the size of the cell. A level too high or low can signal a problem.