ARUP's Laboratory Test Directory

Japanese Encephalitis Virus Antibody, IgM by ELISA : 2005685

Mnemonic: JPN M

Methodology: Semi-Quantitative Enzyme-Linked Immunosorbent Assay
Performed: Thu
Reported: 1-8 days
Specimen Required: Collect: Serum separator tube

Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Transfer 0.5 mL serum to an ARUP Standard Transport Tube. (Min: 0.15 mL)

Storage/Transport Temperature: Refrigerated

Unacceptable Conditions: Contaminated or heat-inactivated specimens

Stability (collection to initiation of testing): After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 6 months (avoid repeated freeze/thaw cycles)
Reference Interval:
Effective January 17, 2012
Japanese Encephalitis Virus Antibody IgM
3.9 IV or less Negative - No significant level of detectable Japanese encephalitis virus (JEV) IgM antibody.
4.0 -6.0 IV Equivocal - Questionable presence of JEV IgM antibody. Repeat testing in 10-14 days may be helpful.
6.1 IV or greater Positive - JEV IgM antibody detected, which may indicate a current or recent infection. A low IgM antibody level may occasionally persist for more than 12 months post-infection.

Interpretive Data: A positive result does not necessarily rule out infection with a different Flavivirus spp. The best evidence of current infection is a significant change on two appropriately timed specimens with both tests performed in the same laboratory at the same time.

Refer to Statement D under Testing Information at http://www.aruplab.com.
CPT Code(s): 86790