Is Vitamin B12 166 low, normal or dangerous? What does Vitamin B12 level 166 mean?

📅 Medical Review Date: December 20, 2025

Your Vitamin B12 level of 166 is a Low Vitamin B12 level.

Low Vitamin B12 levels may indicate underlying health problems. The normal range is typically between 211 pg/mL and 911 pg/mL. 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 Vitamin B12 range for men is :211 - 911 pg/mL

Ideal values of Vitamin B12 depending on age (male) :

Age	Ideal Vitamin B12 value
<5 years	214.503
5-10 years	218.064
10-15 years	221.684
15-20 years	225.364
20-25 years	229.105
25-30 years	232.908
30-35 years	236.774
35-40 years	240.704
40-45 years	244.7
45-50 years	248.762
50-55 years	252.891
55-60 years	257.089
60-70 years	261.357
70-80 years	265.696
80-90 years	270.107
90-100 years	274.591
>100 years	279.149

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

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

Some examples of conditions that increase or decrease Vitamin B12 levels include:

• Crohn disease
• Ulcerative colitis
• Celiac disease
• Reduced stomach acid production
• Pancreatic insufficiency

Normal range of Vitamin B12 found among women :211-911 pg/mL

Ideal values of Vitamin B12 depending on age (female) :

Age	Ideal Vitamin B12 value
<5 years	214.608
5-10 years	218.277
10-15 years	222.009
15-20 years	225.805
20-25 years	229.666
25-30 years	233.593
30-35 years	237.587
35-40 years	241.649
40-45 years	245.781
45-50 years	249.983
50-55 years	254.257
55-60 years	258.604
60-70 years	263.026
70-80 years	267.523
80-90 years	272.097
90-100 years	276.749
>100 years	281.481

If you take a Vitamin B12 blood test and the results are not in the normal range (211-911 pg/mL), 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 Vitamin B12 Test Is Done :

When your doctor orders a Vitamin B12 test, it involves a straightforward blood draw to measure your Vitamin B12 levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your Vitamin B12 test results are usually available within a few hours.

Medical References

• WebMD – Vitamin B12 Blood Test: Uses, Normal Range, and Results
• NIH – Vitamin B12 - Health Professional Fact Sheet
• MedlinePlus – Vitamin B12 level