Do you read contact patch tests on removal at 48 hours, and do those results matter if negative at 72 or 96 hours?

Great question, and one that comes up frequently in clinical practice. I remove patches at 48 hours, and at that point I do perform a quick read or, at a minimum, have the tested areas thoroughly photographed. While it is difficult to draw firm conclusions from a 48-hour read alone, it is genuinely ...