Complement Component C3c and C4c Blood Test

Compare labs

Feature	Labcorp	Quest Diagnostics
Price	Coming soon	$35.49
Results in	—	~5 business days
Sample type	—	Blood Serum
Require fasting	—	No

About the test

Decreased concentrations of both C3 and C4 suggest activation of the classical pathway, whereas decreased concentration of just C3 suggests activation of the alternative pathway. Both complement factors may be used to monitor activity of patients with systemic lupus erythematosus (SLE) and immune complex-induced vasculitis.

Included biomarkers & Reference ranges

Biomarker	Reference range
Complement Component C3c One of the main proteins in your complement system, part of your immune defense. Low levels can indicate active autoimmune disease or certain infections.	—
Complement Component C4c A complement system protein involved in immune defense. Low levels are associated with active autoimmune conditions like lupus, or certain genetic deficiencies.	—

Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.

How it works

1. Order online No referral or insurance
2. Get a requisition By email in 24–72 hours
3. Visit a draw center Bring a matching photo ID
4. Get results Securely by email

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Consultations

Not sure how to read your results? We can help.

Schedule a consultation with a Hormunity specialist. We’ll walk through every marker, interpret what it means for you, and map out the next steps for your care.

Book a specialist