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Classical Pathway Complement Function (CH100)


Classical Pathway Complement Function (CH100)
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Reference Range:

392 - 1019 CH100 U/ml

Turnaround Time:

28 working days


Internal Test Code:- CACF


Indication: Recurrent bacterial infections

Background: Tests functional activity of classical and lytic components of complement system. Reduced activity if any of classical or lytic complement components are low/absent. Defects in classical pathway are rare.

Method: Radial Immunodiffusion (RID)

Repeat: Only to confirm abnormal result


Contact laboratory if advice regarding sample requirements required.

Vessels and Containers:

Serum gold-top

Sample Requirements:

500µl serum


Microbially contaminated, haemolysed, very lipaemic or samples containing particulate matter should not be used. Sera from patients with rheumatoid arthritis may show poor or multiple rings of lysis.

How result is reported:

Numeric in CH100 U/ml

Important Information:

Entry Last Modified 22/05/2019


Complement Function, CA50, CH100

Transportation and Handling:

Sample must reach Immunology lab within 2 hours of venesection. If this is not possible, please arrange for sample to be separated and frozen at -20°C. Separated serum should then be sent on dry ice to Immunology.

Special Precautions:


Time limits for requesting additional examinations:

Not Available for this test.