The Art of Patch Testing

'It is easy to perform patch test, but it is difficult to reach the right conclusion', is Etain Cronin's now classic aphorism. There are many patch testing pitfalls, e.g., false-positive or false-negative reactions due to testing the (presumed) allergens in concentrations that are either too high or too low, or using inadequate test vehicles. To overcome these problems, the 3rd Edition of Patch Testing has been written, providing published test concentrations and vehicles for 4350 chemicals and large numbers of products and groups of (structurally or functionally related) chemicals.

But even if the 'proper' test concentrations and vehicles are used, many other variables may influence the outcome of patch tests and thereby affect their reliability. It may well be stated that it is an 'Art' to properly perform patch tests and reach the right conclusions.

This website would like to contribute to this 'Art of Patch Testing' by pointing out in a scholarly manner the various pitfalls that may be encountered and mistakes that can be made and more in general provide information on how to perform patch testing properly. This part of the website is currently under construction