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ID:842 C1q
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DescriptionPrimary component of classical complement pathway.
IndicationC1q levels are usually only measured in cases where CH50 is absent or the patient has an increased susceptibility to infection, with the excception of the identification of acquired angioedema. C1q deficiency is rare and associated with SLE and recurrent bacterial infections. In suspected deficiency haemolytic complement should be analysed first. C1q is usuful in the differential diagnosis of Aquired Angioedema (AAE).
Additional InfoThe sample must be frozen within 2h of collection. Please inform the laboratory prior to collecting the sample.
Concurrent Testsna
Dietary Requirementsna

InterpretationA deficiency of C1q can lead to a reduced or absent CH50 value. Levels are also low in aquired C1 inhibitor deficiency and reduced in urticarial vasculitis.

Ref. Range (Male)
Ref. Range (Female)
Ref. Range (Paed)
Ref. Range Notes 50 - 250
Unitsmg/L


IP Acute TAT- Not Defined -
IP Routine TAT20 days
GP Acute TAT- Not Defined -
GP Routine TAT20 days
Turnround CommentTurn around time provided by the referral laboratory. Please allow additional time for sample dispatch and return of results.
Originally edited by : BD. Last edited on 14/09/2018 14:24:22. Published By AM on 14/09/2017 14:24:22.