What 14 tests are in a CBC?

A Complete Blood Count (CBC) with Differential typically includes 14 key parameters (or measurements). While the exact count can vary slightly depending on the laboratory’s equipment, most standard reports follow this specific 14-test structure.

Here is the breakdown of the 14 tests, organized by the type of blood cell they measure:

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I. Red Blood Cell (RBC) Parameters (6 Tests)

These tests evaluate your body's ability to transport oxygen and the health of your red cells.

1. RBC Count: Total number of red blood cells.

2. Hemoglobin (Hb): The iron-rich protein that carries oxygen.

3. Hematocrit (Hct): The percentage of total blood volume made of red cells.

4. Mean Corpuscular Volume (MCV): The average size of your red blood cells.

5. Mean Corpuscular Hemoglobin (MCH): The average amount of hemoglobin in each cell.

6. Mean Corpuscular Hemoglobin Concentration (MCHC): The average concentration of hemoglobin in a group of cells.

II. White Blood Cell (WBC) Parameters (6 Tests)

This section includes the total count plus the "Differential," which breaks down the five specific types of immune cells.

7. Total WBC Count (Leukocytes): Your overall immune system strength.

8. Neutrophils: Primary defenders against bacterial infections.

9. Lymphocytes: Key for fighting viruses and creating antibodies.

10. Monocytes: Cells that "clean up" debris and fight chronic infections.

11. Eosinophils: Active during allergic reactions and parasitic infections.

12. Basophils: Involved in intense allergic responses (releasing histamine).

III. Platelet Parameters (2 Tests)

These measure your blood's ability to clot and stop bleeding.

13. Platelet Count (PLT): Total number of platelets.

14. Mean Platelet Volume (MPV): The average size of your platelets (indicates how fast your bone marrow is producing them).

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Important Distinction: CBC vs. CMP

It is common to confuse the 14 tests in a CBC with a CMP (Comprehensive Metabolic Panel), which also contains 14 tests.

• The CBC (listed above) measures cells.

• The CMP measures chemicals in your blood, such as Glucose, Calcium, Sodium, Potassium, and Liver/Kidney enzymes.

Quick Reference Guide

Result	Possible Meaning
Low Hb / RBC / Hct	Anemia (Iron or Vitamin deficiency)
High WBC	Active infection or inflammation
Low Platelets	Risk of easy bruising or bleeding
High MCV	Potential B12 or Folate deficiency
Low MCV	Potential Iron deficiency

Pro Tip for Students: If you see RDW (Red Cell Distribution Width) on your report, it is often an "extra" 15th parameter that measures how much your RBCs vary in size. If the RDW is high, it means your cells are inconsistent, which is a big clue for diagnosing different types of anemia.

Would you like to know the "Normal Ranges" for these 14 parameters in 2026?