We use cookies to help us improve the website and your experience using it. You may delete and block all cookies from this site at any time. However, please note this may result in parts of the site no longer working correctly. If you continue without changing your settings we will assume you are happy to receive all cookies on this site.


Complement C3

General information

Specimen transport: At room temperature

Repeat frequency: At significant change of clinical symptoms, monitoring of treatment.

Special precautions: None

Laboratory information

Normal reference range: Age and gender specific normal range

Test Units 0 days to 4 weeks 4 weeks to 12 years 12-20 years 20-50 years 50-90+ years
C3 g/L 0.32-1.4 0.62-1.6 Male 0.62-1.2
Female 0.62-1.5
0.62-1.6 0.62-1.6


Volume and sample type: 7ml clotted blood

Method: Nephelometry

Turnaround time (calendar days from sample receipt to authorised result): Median - 1, 95th percentile - 5

Clinical information

Indications for the test: Monitoring of SLE. Post streptococcal glomerulonephritis and other conditions of complement activation

Factors affecting the test: Traumatic venepuncture or delay in transport may lead to falsely low levels.


Clinical workstation reference: C3


(Last updated October 7th 2014)