Complete blood count (CBC)

What is a complete blood count?
    A complete blood count (CBC) is a blood test that analyzes various components of the blood to help diagnose diseases or conditions such as: leukemia, thalassemia, anemia, bone marrow disorders, and agranulocytosis (severe leukopenia).

What can a complete blood count measure?
  -Red blood cell count
  -Percentage of red blood cells to total blood volume (hematocrit level)
  -Hemoglobin level, a protein in red blood cells that carries oxygen throughout the body
  -White blood cell count, both total quantity and percentage of each type of white blood cell
  -Platelet count

How to collect a blood sample?
  Blood is drawn from a vein in the elbow crease, amounting to 2.5–3 milliliters. The blood is then placed in a tube containing an anticoagulant called EDTA to prevent clotting. Results will be available within one day.