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Complement C3

Access Labcorp Draw

Sample type: Serum

Requires fasting: No

Phlebotomy required

Details

Complement C3 is a protein in the immune system that plays a key role in the complement cascade, which helps fight infections and clear damaged cells. A C3 test measures its levels in the blood and is often used to evaluate immune function or inflammatory conditions. Low C3 levels may indicate autoimmune diseases like systemic lupus erythematosus (SLE) or complement system deficiencies, while elevated levels can be seen in acute or chronic inflammation.

  • Complement Component C3c

Estimated days for results: Results should arrive 1 - 2 business days after the lab receives samples.

Details
Complement C3 is a protein in the immune system that plays a key role in the complement cascade, which helps fight infections and clear damaged cells. A C3 test measures its levels in the blood and is often used to evaluate immune function or inflammatory conditions. Low C3 levels may indicate autoimmune diseases like systemic lupus erythematosus (SLE) or complement system deficiencies, while elevated levels can be seen in acute or chronic inflammation.

What type of sample is required for this test?
Serum

Test Resources
For more information, please consult your healthcare provider.

1–2 business days

  • Immune System

Blood Draw Options with Fullscript
Fullscript offers several convenient phlebotomy options to complete your lab testing:

Access Labcorp Draw – Labcorp PSC

  • Location: Visit a nearby Labcorp Patient Service Center.
  • Cost: $10 sample collection fee (paid during checkout).
  • Scheduling: Schedule your appointment here. Appointments are recommended to reduce wait times. Walk-ins are accepted, but may experience delays. Aim to arrive 15 minutes before your appointment.
  • Collection Instructions:
    • Bring a valid ID.
    • Bring your digital or printed requisition form, available in the Labs tab of your Fullscript account.
  • Check-in: Follow check-in kiosk steps when you arrive at the Labcorp draw site.
  • More Info: Access Labcorp blood draw guide

Getlabs Mobile Phlebotomy

  • Location: Sample collection at your home or office.
  • Cost: $85 sample collection fee (paid during lab order checkout).
  • Availability: Available in most locations – enter your ZIP code during checkout to confirm.
  • Scheduling: Schedule your appointment here through your Fullscript account.
  • Collection Instructions:
    • Have your digital or printed requisition form and valid ID ready.
    • Your phlebotomist will contact you by phone to coordinate arrival.
  • More Info: Getlabs blood draw guide
State restrictions:

Patient can't order this test if they are located in Hawaii, Puerto Rico, New Jersey, New York, or Rhode Island

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