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Complement C3

A complement blood test measures the levels and/or activity of a group of proteins that are part of the complement system. This system "complements" or enhances your body's defenses against infections and other diseases. Your immune system makes antibodies, which are proteins to fight disease-causing substances like viruses and bacteria.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

17 published ranges, each from a named source
18 y+
90–180 mg/dL
Normal
75–175 mg/dL
Ranges from ARUP Laboratories Test Directory, Mayo Clinic Laboratories (Pediatric Test Catalog), Mayo Clinic Laboratories (Test Catalog).

All source ranges (17)
SourceSexAgeRange
ARUP Laboratories Test Directory All ≤ 30 d 59–121 mg/dL
ARUP Laboratories Test Directory All 30 d – 2 mo 55–129 mg/dL
ARUP Laboratories Test Directory All 2 mo – 3 mo 61–155 mg/dL
ARUP Laboratories Test Directory All 3 mo – 4 mo 67–136 mg/dL
ARUP Laboratories Test Directory All 4 mo – 5 mo 65–182 mg/dL
ARUP Laboratories Test Directory All 5 mo – 6 mo 67–174 mg/dL
ARUP Laboratories Test Directory All 6 mo – 7 mo 77–179 mg/dL
ARUP Laboratories Test Directory All 7 mo – 8 mo 78–173 mg/dL
ARUP Laboratories Test Directory All 9 mo – 11 mo 76–187 mg/dL
ARUP Laboratories Test Directory All 1 y 87–181 mg/dL
ARUP Laboratories Test Directory All 2 y 84–177 mg/dL
ARUP Laboratories Test Directory All 3 y – 4 y 80–178 mg/dL
ARUP Laboratories Test Directory All 5 y – 11 y 80–160 mg/dL
ARUP Laboratories Test Directory All 12 y – 17 y 82–163 mg/dL
ARUP Laboratories Test Directory All 18 y+ 90–180 mg/dL
Mayo Clinic Laboratories (Test Catalog) All all ages 75–175 mg/dL
Mayo Clinic Laboratories (Pediatric Test Catalog) All all ages 75–175 mg/dL

What an abnormal result can be associated with

A low result
Decreased circulating complement C3 concentration
Associations from LOINC2HPO (Human Phenotype Ontology). This is reference information, not a diagnosis: only a clinician can interpret your result in context.
details
Sample
Serum or plasma · LOINC
Collection
Serum gel tube · 1 mL · Mayo Clinic Laboratories (Test Catalog)
Part of
Complement C3 and C4 panel
Listed under
Autoimmune Diseases · Lupus · Rheumatoid Arthritis
Code
LOINC 4485-9 · mg/dL
Also known as
Beta 1 C-globulin, Complement C3, Complmt, Comp
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