ARUP's Laboratory Test Directory
| 0050085: Smith (ENA) Antibody, IgG |
| Test Mnemonic: SMITH | |
|
Methodology: Multi-Analyte Fluorescent Detection
Performed: Sun-Sat Reported: 1-2 days |
| Specimen Required: | |
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Collect: One 4 mL SST.
Transport: 1 mL serum at 2-8°C. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube. Pediatric Collection/Transport: 0.15 mL serum at 2-8°C. Remarks: Separate serum from cells ASAP. Unacceptable Conditions: Plasma and other body fluids. Severely lipemic, contaminated, and hemolyzed specimens. Stability: After separation from cells: Ambient: 2 days; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles) |
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| Reference Interval: |
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29 AU/mL or less: Negative 30-40 AU/mL: Equivocal 41 AU/mL or greater: Positive |
| Interpretive Data: | |
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Smith antibody is very specific for systemic lupus erythematosus (SLE) but only occurs in 30-35% of SLE cases. The presence of antibodies to Smith is often associated with renal disease.
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| CPT Code(s): | |
| 86235 |