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RF concentrations in the plasma samples prior to and following precipitation in patients 1–5 (P1–5). P1 is RF-negative, the rest are RF-positive.
| Plasma sample | RFs prior to precipitation IU/mL | RFs following precipitation IU/mL |
|---|---|---|
| P1 | 4 | 5 |
| P2 | 25 | 12 |
| P3 | 195 | 85 |
| P4 | 236 | 118 |
| P5 | 1141 | 631 |
