Is WBC 3.9 low, normal or dangerous? What does White blood cell count level 3.9 mean?

📅 Medical Review Date: December 27, 2025

Your WBC level of 3.9 is a Low WBC level.

Low WBC levels may indicate underlying health problems. The normal range is typically between 4 thou/uL and 11 thou/uL. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal WBC range for men is :4 - 11 thou/uL

Ideal values of WBC depending on age (male) :

Age	Ideal WBC value
<5 years	4.156
5-10 years	4.318
10-15 years	4.486
15-20 years	4.661
20-25 years	4.843
25-30 years	5.032
30-35 years	5.228
35-40 years	5.432
40-45 years	5.644
45-50 years	5.864
50-55 years	6.093
55-60 years	6.331
60-70 years	6.578
70-80 years	6.835
80-90 years	7.102
90-100 years	7.379
>100 years	7.667

*Ideal values are calculated based on our database of patient records

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Some examples of conditions that increase or decrease WBC levels include:

• Infections, most commonly caused by bacteria and some viruses, less commonly by fungi or parasites
• Bone marrow damage
• Overwhelming infections (e.g., sepsis)
• Inflammation or inflammatory conditions such as vasculitis or inflammatory bowel disease
• Myelodysplastic syndrome

Receive world-class medical opinion about your low WBC levels over email.Upload blood test report now

Normal range of WBC found among women :4-11 thou/uL

Ideal values of WBC depending on age (female) :

Age	Ideal WBC value
<5 years	4.161
5-10 years	4.328
10-15 years	4.502
15-20 years	4.683
20-25 years	4.871
25-30 years	5.067
30-35 years	5.271
35-40 years	5.483
40-45 years	5.703
45-50 years	5.932
50-55 years	6.17
55-60 years	6.418
60-70 years	6.676
70-80 years	6.944
80-90 years	7.223
90-100 years	7.513
>100 years	7.815

If you take a WBC blood test and the results are not in the normal range (4-11 thou/uL), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the WBC Test Is Done :

When your doctor orders a WBC test, it involves a straightforward blood draw to measure your WBC levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your WBC test results are usually available within a few hours.

Medical References

• MedlinePlus – White Blood Count (WBC)
• Cleveland Clinic – White Blood Cells: Types, Function & Normal Ranges
• MedlinePlus – Blood Count Tests