Table 2.
Characteristics of tree nut oral food challenges
| No. | Pass rate | OFC with sIgE <2 kUA/L, no. (%) | OFC with sIgE ≥2 kUA/L, no. (%) | OFC with SPT <3 mm, no. (%) | OFC with SPT ≥3 mm, no. (%) | |
|---|---|---|---|---|---|---|
| All TN challenges | 156 | 86% | 124 (79) | 16 (10) | 101 (65) | 41 (26) |
| TN allergic | 67 | 76% | 60 (90) | 3 (4) | 39 (58) | 25 (37) |
| TN sensitized | 65 | 91% | 47 (72) | 13 (20) | 45 (69) | 16 (25) |
| Avoiding due to other FA | 24 | 100% | 17 (71) | - | 17 (71) | - |
| Almond | 54 | 100% | 42 (78) | 6 (11) | 37 (69) | 11 (20) |
| Cashew | 28 | 79% | 28 (100) | 0 (0) | 18 (64) | 9 (32) |
| Walnut | 27 | 82% | 19 (70) | 3 (11) | 15 (56) | 10 (37) |
| Hazelnut | 18 | 83% | 12 (67) | 4 (22) | 13 (72) | 2 (11) |
| Pecan | 14 | 79% | 10 (71) | 1 (7) | 11 (79) | 3 (21) |
| Pistachio | 13 | 69% | 11 (85) | 2 (15) | 8 (62) | 4 (31) |
| Brazil nut | 2 | 50% | 2 (100) | 0 (0) | 0 (0) | 2 (100) |
TN=tree nut; FA=food allergy; sIgE=specific IgE; SPT=skin prick test.
92% of TN challenges had both sIgE and SPT performed, 9% had SPT performed only, and 9% had sIgE performed only.