According to an article in American Family Physician, the normal range (per cubic millimeter) of white blood cells based on age are:
The normal range for a pregnant women in the 3rd trimester is 5,800–13,200 per cubic millimeter.
High white blood cell count
If a person’s body is producing more white blood cells than it should be, doctors call this leukocytosis.
A high white blood cell count may indicate the following medical conditions:
- allergic responses, such as due to an asthma attack
- those that may cause cells to die, such as burns, heart attack, and trauma
- inflammatory conditions, such as rheumatoid arthritis, inflammatory bowel disease, or vasculitis
- infections, such as with bacteria, viruses, fungi, or parasites
Surgical procedures that cause cells to die can also cause a high white blood cell count.
Low white blood cell count
If a person’s body is producing fewer white blood cells than it should be, doctors call this leukopenia.
Conditions that can cause leukopenia include:
- autoimmune conditions such as lupus and HIV
- bone marrow damage, such as from chemotherapy, radiation therapy, or exposure to toxins
- bone marrow disorders
- sepsis, which is a severe type of infection
- vitamin B-12 deficiencies
Doctors may continually monitor white blood cells to determine if the body is mounting an immune response to an infection.
Source Article from https://www.medicalnewstoday.com/articles/327446.php