uk-drcog MCQ (SBA): Vulval Candidiasis - Diabetes Screening

A 45-year-old woman presents to the GP with a 6-week history of vulval pruritus, burning, and dysuria. On examination, the vulva is erythematous and oedematous with satellite lesions and fissuring at the posterior fourchette. A vaginal swab confirms Candida albicans. This is her first episode. She has no significant medical history. Which underlying condition should be screened for?