Asthma History Taking OSCE, Control Assessment and Trigger Identification

Why Asthma History Is Tested

Asthma affects 5.4 million people in the UK and is one of the most common long-term conditions managed in primary care. Asthma history stations test your ability to assess control, identify triggers, check inhaler technique, and recognise when to step treatment up or refer. Examiners look for structured assessment, not just a list of symptoms.

The Three Core Questions: RCP Asthma Control Assessment

The Royal College of Physicians (RCP) 3 questions are the validated tool for assessing asthma control. You must know these:

1. 1"In the last month, have you had difficulty sleeping because of your asthma symptoms, including cough?"
2. 2"In the last month, have you had your usual asthma symptoms during the day, such as cough, wheeze, chest tightness, or breathlessness?"
3. 3"In the last month, has your asthma interfered with your usual activities, such as housework, work, school, or sport?"

Core Symptom Questions

Explore the four classic symptoms with SOCRATES:

Wheeze

• "Do you get a whistling sound when you breathe?"
• "When does this happen? Exercise, at night, around animals, in cold air?"
• Variability is key: asthma wheeze fluctuates, COPD wheeze is more constant

Breathlessness

• "How breathless do you get? What limits you?"
• "Can you walk to the shops? Climb a flight of stairs?"

Chest tightness

• "Do you ever feel a tightness or pressure in your chest?"
• "When does it come on?"

Cough

• "Do you have a cough? Is it worse at night or first thing in the morning?"
• Nocturnal or early morning cough is a classic asthma pattern

Diurnal Variation

Asthma symptoms have characteristic timing:

• Worse at night or on waking
• Symptoms may be minimal during the day
• This pattern strongly supports an asthma diagnosis

Ask: "Are your symptoms worse at any particular time of day?"

Triggers

Identifying triggers guides management and counselling:

Occupational Asthma

This is a high-yield scenario in OSCE stations. Key features:

• Symptoms are better on days off work or holidays
• Symptoms are worse on Mondays or returning from leave
• High-risk occupations: bakers (flour dust), painters (isocyanates), hairdressers (persulfates), animal workers (dander), healthcare (latex)

Ask: "Do your symptoms get better when you're away from work, like at weekends or on holiday?"

Current Treatment: BTS Step Assessment

Ask about current inhalers:

• "What inhalers are you on? Can you show me how you use them?"
• "Do you use a reliever inhaler (usually blue)? How often each week?"
• "Do you use a preventer inhaler (usually brown or purple)? Every day?"
• "Have you ever needed oral steroids for your asthma?"
• "Have you ever been admitted to hospital or to intensive care?"

Using a reliever inhaler more than 3 times a week = poor control, step up.

Previous Attacks and Severity Markers

Poor prognostic features to ask about:

• Previous life-threatening attack requiring ITU or intubation
• Previous hospital admission in the last year
• Three or more courses of oral steroids in the last year
• Poor perception of breathlessness (patient does not feel how severe their attack is)
• Psychosocial factors: depression, non-compliance, denial

Allergy, Atopy, and Family History

• "Do you have hay fever or eczema?"
• "Any known allergies?"
• "Is there a family history of asthma, hay fever, or eczema?"
• Atopic triad (asthma + eczema + rhinitis) is strong evidence for allergic asthma

Frequently Asked Questions

"How do you assess asthma control in an OSCE history station?"

Asthma control is best assessed using the RCP 3 questions: difficulty sleeping due to asthma in the past month; daytime asthma symptoms such as wheeze, cough, or chest tightness; and interference with daily activities. One positive answer indicates partial control; two or more indicate poor control and the need to step up treatment or review adherence and inhaler technique before escalating. Additional markers of poor control include using a short-acting beta-agonist (SABA) reliever inhaler more than three times per week, waking with nocturnal symptoms, and requiring oral prednisolone courses. These should all be asked about systematically.

"What is occupational asthma and how would you identify it on history?"

Occupational asthma is asthma caused or worsened by exposure to sensitising agents in the workplace. It affects approximately 1 in 6 adults with new-onset asthma. The key historical feature is the work-symptom relationship: symptoms improve on rest days, weekends, and holidays, and worsen on returning to work, classically on Mondays or after returning from leave. High-risk occupations include baking (flour and enzyme dust), spray painting (isocyanates), hairdressing (persulfates), animal handling (dander and urine proteins), and healthcare (latex). Ask specifically: "Do your symptoms get better when you're not at work?" If the answer is yes, this diagnosis must be investigated with serial peak flow monitoring at work and at home, and referral to an occupational medicine or respiratory specialist.

"What would concern you about a patient's asthma history and prompt urgent review?"

Features that indicate a high-risk patient requiring urgent or same-day review include: a previous life-threatening attack requiring admission to ITU or mechanical ventilation; three or more courses of oral steroids in the past year; hospital admission for asthma in the past year; brittle asthma (type 1: persistently chaotic peak flow despite maximal treatment; type 2: sudden severe attacks on a background of apparently well-controlled disease); use of SABA reliever on a daily basis; inability to perceive the severity of their own breathlessness (a known risk factor for fatal attacks); and co-existing psychosocial factors including depression, non-adherence, or chaotic lifestyle. Any of these features warrants urgent specialist referral and an asthma action plan.

"How do you differentiate asthma from COPD on history alone?"

Asthma and COPD can overlap, but key historical features distinguish them. Asthma typically presents before age 40 (though late-onset asthma exists), has a variable and episodic pattern, is associated with atopy (hay fever, eczema, food allergy), and shows diurnal variation with symptoms worse at night and early morning. It is often triggered by identifiable factors and shows significant improvement or full reversibility with bronchodilators. COPD presents insidiously in patients usually over 40 with a significant smoking history (typically over 20 pack-years), causes persistent and progressive breathlessness, and shows only partial reversibility with bronchodilators. Wheeze in asthma is episodic and variable; in COPD it is more constant. A non-smoker with atopy and nocturnal wheeze that disappears between episodes almost certainly has asthma.