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HelpTest Code COL7 Anti-Collagen type VII, IgG Antibodies, Serum
Specimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 2 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Useful For
Initial screening test in the diagnosis of epidermolysis bullosa acquisita and other immunobullous diseases mediated by collagen VII
Method Name
Enzyme-Linked Immunosorbent Assay (ELISA)
Reporting Name
Anti-Collagen type VII, SerumSpecimen Type
SerumSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 30 days | ||
| Ambient | 14 days |
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
| Gross icterus | OK |
Clinical Information
Epidermolysis bullosa acquisita and certain other rare immunobullous diseases, including bullous lupus erythematosus, are caused by the development of IgG antibodies directed against collagen type VII, which lead to blisters and erosions that may heal with scarring. Circulating IgG autoantibodies against collagen type VII can be found in patient serum in these conditions.
Reference Values
Collagen type VII
<20 RU/mL (negative)
≥20 RU/mL (positive)
Interpretation
Antibodies to IgG collagen type VII have been shown to be present in patients with epidermolysis bullosa acquisita and certain other rare immunobullous diseases, including bullous lupus erythematosus
Cautions
The results obtained with collagen type VII enzyme-linked immunosorbent assay kit serve as an aid to diagnosis and should be interpreted in the patient’s clinical context.
Performance of the assay on other matrices besides serum has not been established.
Method Description
This enzyme-linked immunosorbent assay (ELISA) method detects and measures serum levels of antibodies of certain pemphigoid diseases. Calibrators and patient sera are added to microwells coated with collagen type VII antigens, allowing antibodies to react with the immobilized antigens. After washing to remove any unbound serum proteins, horseradish peroxidase-conjugate IgG is added and incubated. Following another wash step, the peroxidase substrate is added and allowed to incubate for an additional period. A stop solution is then added to each well to cancel the enzyme reaction and to stabilize the color development. The assay can be quantified by measuring the reaction photometrically and plotting the results. The amount of antigen-specific bound antibody is proportional to the color intensity.(Unpublished Mayo method)
Day(s) Performed
Varies
Report Available
1 to 5 daysSpecimen Retention Time
30 daysPerforming 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
83516
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| COL7 | Anti-Collagen type VII, Serum | In Process |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 616879 | COL7, S | 94096-5 |