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| Source | Blood | |
| Mnemonic | RF | |
| Specimen Requirements | 1 x 3 mL light green (mint) top PST tube. Gold top SST tube also acceptable. 0.5 mL heparinized plasma or serum | |
| Specimen Handling | ||
| Additional Information | ||
| Testing Location | Chemistry-DSC | |
| Testing Frequency | Weekdays | |
| Alternate Name(s) | ||
| Reference Interval | 0-20.0 kU/L |