Test Details
Methodology
Enzyme immunoassay (EIA)
Result Turnaround Time
14 - 21 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Use
The detection of anti-RNAP III antibodies is useful in the diagnosis of SSc and for the identification of patients at risk for developing progressive skin thickening and renal crisis. The prevalence of IgG RNAP III antibodies is from 3 - 58% in SSc patients.
Specimen Requirements
Specimen
Serum
Volume
1 mL
Minimum Volume
0.3 mL (Note: This volume does not allow for repeat testing.)
Container
Red-top tube or gel-barrier tube
Collection Instructions
Separate serum from cells within one hour of collection. Transfer to a plastic transport tube before shipping. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 14 days |
Frozen | 60 days |
Freeze/thaw cycles | Stable x1 |
Reference Range
• Negative: <20 Units
• Weak Positive: 20–39 Units
• Moderate Positive: 40–80 Units
• Strong Positive: >80 Units
Storage Instructions
Refrigerate or freeze.
Causes for Rejection
Grossly hemolyzed; bacterial contamination; lipemic specimen; icteric specimen; non-serum specimen types
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 520021 | Anti-RNA Polymerase III (RDL) | 63329-7 | 520022 | Anti-RNA Polymerase III (RDL) | Units | 63329-7 |
| Order Code | 520021 | |||||
| Order Code Name | Anti-RNA Polymerase III (RDL) | |||||
| Order Loinc | 63329-7 | |||||
| Result Code | 520022 | |||||
| Result Code Name | Anti-RNA Polymerase III (RDL) | |||||
| UofM | Units | |||||
| Result LOINC | 63329-7 |