Table of Contents
How do you count RBC and WBC?
Red blood cell (RBC) count: 3.93 to 5.69 million cells per cubic millimeter (million/mm3) Hemoglobin (Hgb, Hb): 12.6 to 17.5 grams per deciliter (g/dL) for males; 12.0 to 16 g/dL for females. Hematocrit (HCT): 38% to 47.7% White blood cell (WBC) count: 3,300 to 8,700 cells per cubic millimeter (thousand/mm3)
How is an RBC count calculated?
The blood cell determination involves counting cells in several squares of the grid and obtaining an average number. That number is multiplied by a factor that compensates for the amount of dilution. The final result expresses the number of red blood cells per cubic millimeter of the original blood sample.
How do you calculate WBC count?
Here is the formula to calculate the corrected WBC count:
- Corrected WBC = observed WBC count x (100 ÷ [nRBC + 100])
- Note: nRBC is the number of nucleated RBC.
- Corrected WBC = observed WBC count x (100 ÷ [nRBC + 100])
- Corrected WBC = 14,500 x (100 ÷ [5 + 100])
- Corrected WBC = 14,500 x (100/105)
- = 14,500 x 0.95.
- = 13,809.
What is the normal range for WBC and RBC?
How to find normal values
| Test | Result | Reference range# |
|---|---|---|
| WBC (white blood cells) | 6.2 x 1000/mm3 | 5–10 |
| RBC (red blood cells) | 4.4 x 1,000,000/mm3 | 4.2–6.1 |
| Hgb (hemoglobin) | 9 g/dL (L) | 12–18 |
| Hct (hematocrit) | 28% (L) | 37–52 |
Should WBC be higher than RBC?
If an infection develops, white blood cells attack and destroy the bacteria, virus, or other organism causing it. White blood cells are bigger than red blood cells and normally are fewer in number.
What are normal RBC counts?
A normal range in adults is generally considered to be 4.35 to 5.65 million red blood cells per microliter (mcL) of blood for men and 3.92 to 5.13 million red blood cells per mcL of blood for women. In children, the threshold for high red blood cell count varies with age and sex.
What is the normal RBC count and total WBC count?
Results
| Red blood cell count | Male: 4.35-5.65 trillion cells/L* (4.35-5.65 million cells/mcL**) Female: 3.92-5.13 trillion cells/L (3.92-5.13 million cells/mcL) |
|---|---|
| Hematocrit | Male: 38.3-48.6 percent Female: 35.5-44.9 percent |
| White blood cell count | 3.4-9.6 billion cells/L (3,400 to 9,600 cells/mcL) |
What causes decreased WBC and RBC?
Specific causes of a low white blood cell count include: Aplastic anemia. Chemotherapy. HIV/AIDS. Hypersplenism (an abnormality of the spleen causing blood cell destruction) Kostmann’s syndrome (a congenital disorder involving low production of neutrophils) Leukemia.
What does high WBC and high RBC mean?
High WBC count usually means there is increase in production of these cells to fight a possible infection. It may also means it is a reaction to a drug that helps in improving the WBC production. Bone marrow diseases may also cause high white blood cells count.
What causes elevated WBC and RBC?
Some conditions associated with elevated WBC count in a lab test can include: The common cold or flu caused by a viral infection. Bacterial infections caused by Strep or Staph strains of bacteria like cellulitis, strep throat, or bacterial pneumonia. Asthma or allergies that cause an inflammatory response in your body.