Test Details
Methodology
Turbidimetry
Result Turnaround Time
7 - 14 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 most consistent serologic finding in patients with Rheumatoid Arthritis is an increase in the concentration of RF IgM in blood and synovial fluid. RF by Turbidimetry is 95% IgM.
Specimen Requirements
Specimen
Synovial fluid only
Volume
1 mL
Minimum Volume
0.3 mL (Note: This volume does not allow for repeat testing.)
Container
Transport tube or other container
Collection Instructions
Collect synovial fluid aseptically into tube or other container.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 14 days |
Frozen | 60 days |
Freeze/thaw cycles | Stable x1 |
Storage Instructions
Store frozen or refrigerated.
Causes for Rejection
Grossly hemolyzed; bacterial contamination; lipemic, icteric, non-synovial body fluids
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 520164 | RF by Turb,Synovial Fluid(RDL) | 30231-5 | 520165 | RF by Turb,Synovial Fluid(RDL) | IU/mL | 30231-5 |
| Order Code | 520164 | |||||
| Order Code Name | RF by Turb,Synovial Fluid(RDL) | |||||
| Order Loinc | 30231-5 | |||||
| Result Code | 520165 | |||||
| Result Code Name | RF by Turb,Synovial Fluid(RDL) | |||||
| UofM | IU/mL | |||||
| Result LOINC | 30231-5 |