🔬 Autoimmune & Inflammation
Complement C3 & C4
المتممة C3 و C4
Sample Type
🧪 Blood
Results In
⏱ 48 Hours
Fasting
✅ Not Required
Parameters
📊 2
What is Complement C3 & C4?
Measures complement proteins C3 and C4, parts of the immune system that help fight infection. Low levels indicate complement consumption in autoimmune diseases like lupus.
Why is this test important?
Low C3 and C4 are characteristic of active lupus, especially lupus nephritis. C4 drops before C3 in lupus flares. Also low in hereditary angioedema (C4 only).
How to Prepare
No special preparation required.
Test Parameters & Normal Ranges
| Parameter | Normal Range | Unit |
|---|---|---|
| Complement C3 | 90 – 180 | mg/dL |
| Complement C4 | 10 – 40 | mg/dL |
Frequently Asked Questions
Do I need to fast before my blood test?▼
It depends on the test. Tests like lipid profile and fasting blood sugar require 10-12 hours of fasting. Tests like CBC, vitamin D, and thyroid do not require fasting. Each test page on our website clearly states the fasting requirements.
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Medical Disclaimer: The information on this page is for educational purposes only and should not be considered medical advice. Always consult your physician or qualified healthcare provider for diagnosis and treatment. Test results should be interpreted by a qualified medical professional.