Predictive factors for Day 7 positive patch test readings at a secondary referral centre.

Background: Based on studies at tertiary centres it is known that patch test reading on Day (D) 7 may show additional positive reactions. Female gender, higher age and allergen groups of topicals and corticosteroids were identified as predictive factors.

Objectives: The first aim was to study the value of reading patch tests on D2, D3 and D7 at a secondary referral centre.