Complement C4a Blood Test

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Feature	Labcorp	Quest Diagnostics
Price	$239.49	$239.49
Results in	~7 business days	~5 business days
Sample type	Blood Plasma	Blood Plasma
Require fasting	No	No

About the test

Complement 43a is a protein fragment produced during activation of the complement system, a key part of the immune response. Measuring C4a can help evaluate immune activation and inflammation, and may be useful in investigating autoimmune or inflammatory conditions.

Included biomarkers & Reference ranges

Biomarker	Reference range
Complement C4a An activation fragment produced when complement protein C4 is triggered. Reflects how active your complement immune pathway currently is.	—

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.

Preparation

Do not take radioactive isotopes for 48 hours before your blood draw.

Quest Diagnostics lists no special preparation for this test.

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.

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