COMPARISON OF 2 TESTS FOR CLINICAL-ASSESSMENT OF FORMALDEHYDE EXPOSURE

The objective of the study was to obtain further experience on the app licability of 2 tests for clinical assessment of formaldehyde exposure . About 1300 products brought in by consecutive formaldehyde-sensitive eczema patients during a 2-year period were tested with both the chro motropic acid test and the acetylacetone test. The chromotropic acid t est was modified by including a 2nd reading after 2 days. The outcome was identical for about 90% of the products, and 74% of the products t hat were positive on day 2 were also positive on day 1. More than 1/2 of the tests that scored as traces or caused problems on day 1 became positive on day 2. For products analyzed with both the chromotropic ac id test (day 2 readings) and the acetylacetone test, about 80% gave id entical results. Positive reactions were frequently found for hair sha mpoo, creams and lotions, soap and skin cleansers, make-up and dishwas hing liquids. The samples causing discolouration or problems in the te sts were mostly concentrated in specific product categories. Very few products caused problems in both test methods. Thus, the most convenie nt test can be used as the Ist choice and, for product categories caus ing discolouration or problems with a specific test, the other test me thod can be used.