A complete blood count (CBC) is a blood test used to evaluate your overall health.
- RBC Red blood cells, which carry oxygen
- WBC White blood cells, which fight infection
- Hemoglobin, the oxygen-carrying protein in red blood cells
- Hematocrit, the proportion of red blood cells in the plasma
- Platelets tests for blood clotting
- Red blood cell count, hemoglobin and hematocrit.If all 3 are low you likely have anemia. Anemia causes fatigue and weakness. Anemia may be caused by low vitamins, iron, or blood loss. If the levels are high you may have polycythemia vera or heart disease.
- White blood cell count. A low white blood cell count may be caused by an autoimmune disorder that destroys white blood cells, bone marrow problems or cancer. A high count may show an infection or excess inflammation.
- Platelet count. A platelet count that’s lower than normal (thrombocytopenia) or higher than normal (thrombocytosis) is often a sign of an underlying medical condition, or it may be a side effect from medication.