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Geisinger Medical Laboratories Test Catalog
RHEUMATOID FACTOR |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB3007 Geisinger Epic ID: 7385 | |
SPECIMEN COLLECTION |
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Specimen type: |
Serum or plasma | |
Preferred collection container: |
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Specimen required: |
2 mL aliquot serum or plasma; minimum 0.2 mL | |
Patient preparation: |
Fasting specimen preferred. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Allow serum to clot. Centrifuge to separate serum or plasma within 2 hours of collection. | |
Transport temperature: |
Refrigerated (preferred). Room temperature or frozen specimen also acceptable. | |
Specimen stability: |
Room temperature: 24 hours. Refrigerated: 8 days. Frozen: 3 months. | |
Rejection criteria: |
Stability limits exceeded. | |
TEST DETAILS |
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Reference interval: |
< 14 IU/mL | |
CPT code(s): |
86431 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Test includes: |
Rheumatoid factor. | |
Methodology: |
Immunoturbidity |
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Synonyms: |
RF
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Clinical significance: |
Elevated RF is found in collagen vascular disease such as SLE, rheumatoid arthritis, scleroderma, Sjögren's syndrome, and in other conditions such as leprosy, tuberculosis, syphilis, malignancy, thyroid disease, and in a signfiicant percentage of otherwise normal elderly patients. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |