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HelpTest Code CHIKG Chikungunya IgG, Antibody, Serum
Method Name
Only orderable as part of a profile. For more information see CHIKV / Chikungunya IgM and IgG, Antibody, Serum.
Enzyme-Linked Immunosorbent Assay (ELISA)
Reporting Name
Chikungunya IgG, Ab, SSpecimen Type
SerumSpecimen Required
Only orderable as part of a profile. For more information see CHIKV / Chikungunya IgM and IgG, Antibody, Serum.
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 30 days | |
| Frozen | 30 days |
Reference Values
Only orderable as part of a profile. For more information see CHIKV / Chikungunya IgM and IgG, Antibody, Serum.
Negative
Reference values apply to all ages.
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
86790
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CHIKG | Chikungunya IgG, Ab, S | 88630-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CHIKG | Chikungunya IgG, Ab, S | 88630-9 |
Day(s) Performed
Bimonthly on the second and forth Wednesday
Report Available
Same day/1 to 14 daysUseful For
Aiding in the diagnosis of recent infection with Chikungunya virus detecting IgG antibodies in patients with recent travel to endemic areas and a compatible clinical syndrome
Specimen Minimum Volume
0.4 mL
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
Clinical Information
Chikungunya virus (ChikV) is a single-stranded RNA alphavirus and a member of the Togaviridae family of viruses. The name Chikungunya is derived from the language of the Makonde ethnic groups in southeast Africa and means "that which bends" or "stooped walk." This is in reference to the hunched-over appearance of infected individuals due to the characteristically painful and incapacitating arthralgia caused by the virus. ChikV is endemic throughout Africa, India, and, more recently, the Caribbean islands. In 2014, the first case of autochthonous, or local transmission, in the United States occurred in Florida.
Humans are the primary reservoir for ChikV and Aedes species mosquitos are the primary vectors for transmission. Unlike other mosquito-borne viruses such as West Nile virus and Dengue, the majority of individuals who are exposed to ChikV become symptomatic, with the most severe manifestations observed at the extremes of age and in those with suppressed immunity. Once exposed to ChikV, individuals develop lasting immunity and protection from reinfection.
Prior to development of symptoms, the incubation period ranges, on average, from 3 to 7 days. Infected patients typically present with sudden-onset high fever, incapacitating joint pain, and often a maculopapular rash lasting anywhere from 3 to 10 days. Notably, symptom relapse can occur in some individuals 2 to 3 months following resolution of initial symptoms. Currently, there are no licensed vaccines and treatment is strictly supportive care.
Interpretation
IgM and IgG Negative:
-No serologic evidence of exposure to Chikungunya virus. Repeat testing on a new specimen collected in 5 to 10 days is recommended if clinical suspicion persists.
IgM and IgG Positive:
-IgM and IgG antibodies to Chikungunya virus detected, suggesting recent or past infection. IgM antibodies to Chikungunya virus may remain detectable for 3 to 4 months post-infection.
IgM Positive, IgG Negative:
-IgM antibodies to Chikungunya virus detected, suggesting recent infection. Repeat testing in 5 to 10 days is recommended to demonstrate anti-Chikungunya virus IgG seroconversion to confirm current infection.
IgM Negative, IgG Positive:
-IgG antibodies to Chikungunya virus detected, suggesting past infection.
IgM and/or IgG Borderline:
-Repeat testing in 10 to 14 days is recommended.
Cautions
Specimens collected too early following infection may be negative for antibodies to Chikungunya virus. Testing of convalescent serum is recommended.
Chikungunya and Dengue viruses currently co-circulate in endemic areas and infections can present similarly in symptomatic patients. It is therefore recommended to evaluate at-risk patients for infection with both viruses.
Method Description
For the Chikungunya virus IgG assay, polystyrene microwells are coated with recombinant Chikungunya antigen. Diluted serum samples and controls are incubated in the wells to allow anti-Chikungunya antibodies (if present in the sample) to react with the antigen. Nonspecific reactants are removed by washing. Next, peroxidase-conjugated antihuman antibody is added to the wells and will react with human antibodies bound to the antigen. Excess conjugate is removed by washing. Enzyme substrate and chromogen are added, and the color is allowed to develop. After adding the Stop Reagent, the resultant color change is quantified by a spectrophotometric reading of optical density (OD). Sample optical density readings are compared with reference cut-off OD readings to determine the qualitative results.(Package inserts: Anti-Chikungunya virus ELISA IgG. , Euroimmun Ag; v. 12/20/2018)