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. 1979 Apr;36(1):117–129.

Detection of immune complexes by a new assay, the polyethylene glycol precipitation-complement consumption test (PEG-CC).

G D Harkiss, D L Brown
PMCID: PMC1537710  PMID: 111880

Abstract

A new assay for the detection of circulating immune complexes, the polyethylene glycol precipitation-complement consumption assay (PEG-CC), is described. The test is both simple and sensitive, and exhibits a high degree of specificity. Immune complexes are first isolated from serum by precipitation in 2.5% polyethylene glycol (PEG) and concentrated. They are then assayed functionally by measuring their ability to fix complement using a sensitive kinetic assay for total haemolytic complement. The test can detect aggregated IgG in serum at concentrations around 6.0 micrograms/ml (about 2.0 micrograms absolute. Using DNA-anti-DNA and ovalbumin-anti-ovalbumin immune complexes prepared in vitro, antigen concentrations less than 0.5 micrograms/ml can be detected. Interference by endogenous complement, polyanions and other factors in test sera has been virtually eliminted by the design of the assay. The increased specificity of the PEG-CC test for immune complexes, should prove useful in the diagnosis and monitoring of immune complex-mediated diseases.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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