Test Results For:
Complement C4
Test Overview
- Test Name
-
Complement C4
- Test Code
- C4
Short Description
Complement C4
Test Name
Complement C4
Test Code
C4
Category
Biochemistry
TAT
Main Lab:
6,
Hour(s)
Family Site:
<8hrs, <6hrs
Specimen(s)
1 x Venous blood - 5 mL Tube - Gold - SST-Serum Separator Tube
Specimen Type
SST-Serum Separator Tube
Specimen Format
Tube
Specimen Colour
Gold
Specimen Volume
5 mL
Sampling Order
2
Origin
Venous blood
Collection Time after baseline
-
Transport Temperature
2-8°C
Accepted Other Specimens
Lithium Heparin Plasma
TAT
Main Lab:
6,
Hour(s)
Family Site:
<8hrs, <6hrs
Test Stability
Room Temp:
2 Day(s)
2–8°C:
2 Day(s)
Methodology
-
Specimen Type
SST-Serum Separator Tube
Other Type of Specimen Accepted
Lithium Heparin Plasma
Delay before pre-treatment
6
Transport temperature
2-8°C
Test stability at room temperature
2 Day(s)
Test stability at 2–8°C
2 Day(s)
Haemolysis interference
No
Clinical Interest
The C4 complement assay is a laboratory test that measures the level of C4 protein in the blood, an important component of the complement system, which is part of the immune system. As with C3, the C4 assay is used to diagnose and monitor various autoimmune and inflammatory diseases and other pathological conditions.
Normal levels of C4 vary between 10 and 40 mg/dL.
Decreased C4 levels suggest increased consumption due to complement activation, typically in the context of autoimmune or chronic inflammatory diseases. Elevated levels may indicate an acute inflammatory response.
Like C3, C4 can be used to monitor transplant rejection, particularly in the early stages when complement may be activated.
Clinical Information Required
-
Patient Collection Note
-
LOINC Code
98-2, 4498-2
Outwork
No