Is C Peptide 1 low, normal or dangerous? What does C Peptide level 1 mean?

📅 Medical Review Date: April 17, 2026

Your C Peptide level of 1 is a Low C Peptide level.

Low C Peptide levels may indicate underlying health problems. The normal range is typically between 1.1 ng/mL and 4.4 ng/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.

Important - Scroll to the end of this article to see how our patients managed their low C Peptide levels

The normal C Peptide range for men is :1.1 - 4.4 ng/mL

**Ideal values of C Peptide depending on age (male) :**
Age	Ideal C Peptide value
<5 years	1.111
5-10 years	1.122
10-15 years	1.133
15-20 years	1.144
20-25 years	1.155
25-30 years	1.167
30-35 years	1.179
35-40 years	1.191
40-45 years	1.203
45-50 years	1.215
50-55 years	1.227
55-60 years	1.239
60-70 years	1.251
70-80 years	1.264
80-90 years	1.277
90-100 years	1.29
>100 years	1.303

*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.

Important - Read more questions about low C Peptide levels after this video message

Important - At the end of this article read how our patients treated their low C Peptide levels

Normal range of C Peptide found among women :1.1-4.4 ng/mL

**Ideal values of C Peptide depending on age (female) :**
Age	Ideal C Peptide value
<5 years	1.111
5-10 years	1.122
10-15 years	1.134
15-20 years	1.146
20-25 years	1.158
25-30 years	1.17
30-35 years	1.182
35-40 years	1.194
40-45 years	1.206
45-50 years	1.218
50-55 years	1.231
55-60 years	1.244
60-70 years	1.257
70-80 years	1.27
80-90 years	1.283
90-100 years	1.296
>100 years	1.309

Also Read :Symptoms of Low C Peptide

If you take a C Peptide blood test and the results are not in the normal range (1.1-4.4 ng/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 C Peptide Test Is Done :

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

Medical References

Symptoms

Medically Reviewed By

Dr. Hernandez, MD

BOARD CERTIFIED PATHOLOGIST

Laboratory Medicine Specialist

View Full Profile & Credentials →

Laboratory Expertise:

Clinical Pathology Certification
15+ years lab analysis experience
Specializes in test interpretation
Medical Advisory Board Member

Medical Disclaimer: This information is for educational purposes and should not replace professional medical advice. Consult your physician for diagnosis and treatment. Read full disclaimer.