Patch testing with a mixture of 2 phenol-formaldehyde resins.
1310 patients were routinely patch tested with a paratertiary-butylphenol-formaldehyde resin (PTBP-F-R), a resol resin based on phenol and formaldehyde (P-F-R-2), and a mixture of these 2 resins. Approximately 2.5 times more patients with contact allergy to phenol-formaldehyde resins were diagnosed when routinely patch tested with P-F-R-2 in addition to PTBP-F-R. Although patch testing with a mixture of both resins was not as good as patch testing with the 2 resins separately, it was better than testing only with PTBP-F-R, since 1.6 times more patients with contact allergy to phenol-formaldehyde resins were still diagnosed. P-F-R-2 is therefore recommended for routine patch testing, preferably as a separate patch test but otherwise as a mixture with PTBP-F-R.
Bruze
M
M
Department of Occupational Dermatology, University Hospital, Lund, Sweden.
D003877:Dermatitis, Contact / Q000209:etiology; D009783:Dermatitis, Occupational / Q000139:chemically induced; D005557:Formaldehyde / Q000276:immunology*; D006801:Humans; D010328:Patch Tests; D010636:Phenols / Q000276:immunology*; D011108:Polymers / Q000276:immunology*; D012117:Resins, Synthetic / Q000276:immunology*
D010636:Phenols; D011108:Polymers; D012117:Resins, Synthetic; D005557:Formaldehyde; C014273:p-tert-butylphenolformaldehyde resin; C011529:phenol-formaldehyde resin