ARUP's Laboratory Test Directory

Coxsackie A9 Virus Antibodies by CF : 0050503

Mnemonic: COX A9

Methodology: Semi-Quantitative Complement Fixation
Performed: Sun-Sat
Reported: 1-3 days
Specimen Required: Collect: Serum separator tube.

Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.25 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as acute or convalescent.

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Contaminated, hemolyzed, or severely lipemic specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval:
< 1:8
Interpretive Data: Single positive antibody titers of greater than 1:32 may indicate past or current infection.  Seroconversion or an increase in titers between acute and convalescent sera of at least fourfold is considered strong evidence of current or recent infection.
CPT Code(s): 86658
Cross References: Enterovirus (Coxsackie A9 Virus Antibodies by CF)