← Lab references

Inflammation, Autoimmunity, and Immunoglobulins

Complement C4 — lab reference

Ask your clinician to use performing-lab range and trend.

Updated Sep 23, 2026 · Educational reference

Purser Wellness reference range

This is Purser Wellness’s adult reference. Your own lab may print a different interval. Some entries need more context than a single number.

Unit
mg/dL
Male
14-40
Female
14-40

How to read this marker

Ask your clinician to use performing-lab range and trend.

The wider testing context

An autoimmune test cannot be read from a high or low flag alone. Symptoms, the pattern and strength of the result, repeat testing, and other findings matter.

Using this range

These are starting ranges for adults who are not pregnant, unless this page says otherwise. Your lab may use a different range. Compare the units, sample, and collection details with your own report. Medicines and health history also matter. Ask your clinician what your result means for you.

A question to bring to your visit

How does the Complement C4 range here compare with my lab’s range, and what else matters for me?

Compare with your report

Before discussing a result, keep these details together:

  • Your result and its units
  • The range printed by your own lab
  • When the sample was collected, and the sample type or method if shown
  • Medicines, supplements, and changes in your health that may matter

A number on this page cannot diagnose a condition or choose a treatment for you. Your clinician can help put it in context.

Dr. Purser’s adult reference range may differ from the range printed by your lab. Compare the units and discuss your result with your clinician.

Names you may see

Complement C4