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Effect of rheumatoid factor (RF) positivity on mast cell tryptase (MCT) values following heterophilic antibody blocking tubes (HBT) treatment in relation to pre-HBT RF levels (P < 0·0001).
| <17% change in tryptase value | >17% change in tryptase value | Total | |
|---|---|---|---|
| RF negative | 55 | 1 | 56 |
| RF positive | 13 | 14 | 27 |
