Abstract
Patch tests with a series of 39 substances were performed in 41 patients on one side of the upper aspect of the back. Testing was repeated on the contralateral side of the back 1 week later (sequential testing). In 35 other patients, duplicate patch test series were simultaneously applied on both sides of the back (concomitant testing). If a positive reaction to a test substance was obtained at only one side of the back, the result was regarded as nonreproducible. Of all positive reactions, 40.0% were nonreproducible at sequential testing and 43.8% were nonreproducible at concomitant testing. Weakly positive reactions were far more often non-reproducible than stronger reactions.
| Original language | English |
|---|---|
| Pages (from-to) | 1196-1202 |
| Number of pages | 7 |
| Journal | Journal of the American Academy of Dermatology |
| Volume | 21 |
| Issue number | 6 |
| DOIs | |
| State | Published - 1989 |
| Externally published | Yes |