Prevalence of patch testing and methodology of dermatologists in the US: results of a cross-sectional survey.

BACKGROUND

Patch testing is considered to be the standard for diagnosis of delayed-type hypersensitivity reactions of the skin (allergic contact dermatitis).

OBJECTIVE

The objective of this study was to examine the prevalence of patch testing by US dermatologists and associated practice characteristics.

METHODS

One-third of US Fellows of the American Academy of Dermatology were sampled systematically with a written survey. Responses from this survey were compared with responses from a 1990 survey of dermatologists.

RESULTS

Eighty-three percent of responding dermatologists stated that they performed patch testing in their practice. Whereas the majority of patch testing dermatologists (52%) used a 48-hour, 96-hour patch test reading schedule, 26% performed a single reading at 48 or 72 hours. Among patch testing dermatologists, most (74%) used TRUE Test, and many (44%) did so because it was less time consuming for staff. Many dermatologists (46%) felt that they were patch testing more patients now than when TRUE Test was not available. Eleven percent of dermatologists who patch tested also photopatch tested.

CONCLUSIONS

The proportion of US dermatologists who patch test has significantly increased from 1990 to 1997 (P <.0001). Whereas the majority of US dermatologists patch test, one quarter of those who do so perform only a single reading.