Is WBC 3.91 low, normal or dangerous? What does White blood cell count level 3.91 mean?

📅 Medical Review Date: November 28, 2025

Your WBC level of 3.91 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	4.487
15-20 years	4.662
20-25 years	4.844
25-30 years	5.033
30-35 years	5.23
35-40 years	5.434
40-45 years	5.646
45-50 years	5.867
50-55 years	6.096
55-60 years	6.334
60-70 years	6.582
70-80 years	6.839
80-90 years	7.106
90-100 years	7.384
>100 years	7.673

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

Get Advice via Email : Send us your blood test report, and our WBC experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides WBC, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

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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	4.329
10-15 years	4.503
15-20 years	4.684
20-25 years	4.873
25-30 years	5.069
30-35 years	5.273
35-40 years	5.485
40-45 years	5.706
45-50 years	5.936
50-55 years	6.175
55-60 years	6.424
60-70 years	6.683
70-80 years	6.952
80-90 years	7.232
90-100 years	7.523
>100 years	7.826

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