Questionnaire/history: Obsessions (unwanted intrusive thoughts, image or urge that repeatedly enters the mind, and that usually causes marked anxiety or distress)? - Fear of contamination from dirt, germs, viruses, bodily fluids or faeces, chemicals, sticky substances, dangerous materials (eg asbestos)? - Fear of harm? - Excessive concern with order or symmetry? - Superstition, fear of 'bad' numbers, 'magical' thinking or religious obsessions? - 'Forbidden' thoughts or images (such as being a paedophile, blasphemy, violence, sexual or criminal acts, harm to others, harming own baby)? Compulsions (repetitive behaviours or mental acts that feels driven by obsession(s) to perform, either overt and observable or a covert mental act that cannot be observed)? - Repetitive hand washing — due to fear of contamination? - Checking (eg that doors are locked, electrical items unplugged, gas taps are off) — due to fear of harm to self or others? - Ordering, arranging, and/or repeating — due to excessive concern with order or symmetry? - Mental compulsions (eg special words or prayers repeated in a set manner, asking for forgiveness, excessive counting) — due to religious beliefs, 'magical' thinking, superstitions? - Memory checking and avoidance of triggers — due to concerns about 'forbidden' thoughts or images? Screening questions: Do you wash or clean a lot? Do you check things a lot? Is there any thought that keeps bothering you that you'd like to get rid of, but cannot? Do your daily activities take a long time to finish? Are you concerned about putting thinks in a special order, or are you upset by mess? Do these problems trouble you? DSM-V diagnostic criteria fulfilled? ICD-10 diagnostic criteria fulfilled? Past medical history? Current medication? Previous treatments? Drug allergies? Occupational history? Examination: Risk of self-harm or harming others? Yale-Brown Obsessive Compulsive Scale (Y-BOCS) Functional impairment? - Mild? - Moderate? - Severe? Management Reference(s): NICE CKS: Obsessive-compulsive disorder Information for parents/carers: Royal College of Psychiatrists: Obsessive-compulsive disorder (OCD) MIND: Obsessive-compulsive disorder (OCD)