Asthma Control Test

A validated, 5‑question screening tool to evaluate asthma control in adults and adolescents (12+ years).Answer each question based on your experience over the past 4 weeks. Get instant results, a clear control-level classification,and actionable, evidence‑based recommendations to discuss with your healthcare provider.

Question 1 of 5
In the past 4 weeks, how often did asthma interfere with your daily activities (work, school, home)?
Question 2 of 5
In the past 4 weeks, how often did you have shortness of breath?
Question 3 of 5
In the past 4 weeks, how often did asthma symptoms (wheezing, coughing, chest tightness, shortness of breath) wake you up at night or early in the morning?
Question 4 of 5
In the past 4 weeks, how often did you use your rescue/reliever medication (e.g., albuterol, salbutamol)?
Question 5 of 5
How would you rate your asthma control in the past 4 weeks?
Your privacy matters: All responses are processed locally in your browser. No data is sent to any server. This tool is for educational and self‑monitoring purposes only.

Understanding the Asthma Control Test (ACT)

The Asthma Control Test (ACT) is a clinically validated, patient‑reported outcome measure developed by researchers at the University of Toronto and endorsed by the Global Initiative for Asthma (GINA). It consists of five simple questions that assess key domains of asthma control: symptom frequency, activity limitation, nocturnal awakenings, reliever medication use, and self‑perceived control. The ACT has been extensively studied and is widely used in primary care, pulmonary clinics, and asthma research to guide treatment decisions.

ACT Score = Σ (Q1 + Q2 + Q3 + Q4 + Q5)

Each question scored 1–5, total range 5–25. Higher scores indicate better control.

Why the ACT Matters for Asthma Management

Asthma is a chronic inflammatory airway disease affecting over 300 million people worldwide. Proper control assessment is essential to reduce exacerbations, improve quality of life, and prevent long‑term airway remodeling. The ACT provides a quick, reliable snapshot of control that correlates well with objective measures such as spirometry and fractional exhaled nitric oxide (FeNO). Studies have shown that an ACT score ≤ 19 is a strong predictor of future exacerbations, making this tool invaluable for both patients and clinicians.

The ACT is uniquely valuable because it captures the patient's perspective — an aspect often overlooked in purely objective assessments. It empowers individuals to recognize patterns in their symptoms and take proactive steps, such as adjusting medication or avoiding triggers, in partnership with their healthcare team.

How to Interpret Your ACT Score

The ACT score is divided into three clinically meaningful categories based on extensive validation studies:

  • 20–25 (Well‑controlled): Your asthma is well managed. Continue your current treatment plan and maintain regular follow‑up with your provider.
  • 16–19 (Not well‑controlled): Your asthma is partially controlled. Consider discussing a treatment adjustment (e.g., stepping up therapy) with your healthcare provider.
  • 5–15 (Very poorly controlled): Your asthma is not well controlled. This requires prompt medical review. You may need a significant change in your management plan.

A drop in ACT score by 3 or more points between visits is considered clinically significant and should prompt a review of adherence, inhaler technique, environmental triggers, and comorbidities such as allergic rhinitis or GERD.

Evidence Base and Clinical Validation

Key Validation Studies

The ACT was originally validated in a cohort of over 1,700 patients with asthma. Cronbach's alpha (internal consistency) was 0.85, and test‑retest reliability was excellent (r = 0.82). The ACT showed strong correlation with specialist assessment of control (r = 0.76) and discriminated well between patients with different levels of control as judged by pulmonologists. Subsequent studies have confirmed its utility across diverse populations, including children, adolescents, and adults, as well as in different healthcare settings.

A landmark study by Schatz et al. (2006) demonstrated that an ACT score ≤ 19 had a sensitivity of 71% and specificity of 71% for detecting uncontrolled asthma, making it a reliable screening tool. The ACT is now recommended by GINA as a core component of asthma assessment in both initial evaluation and ongoing monitoring.

Common Misconceptions About Asthma Control

  • “I don't have symptoms, so my asthma is controlled.” — Asthma can be present with minimal symptoms but still have underlying inflammation. Regular ACT monitoring helps detect suboptimal control.
  • “I only need to use my rescue inhaler occasionally.” — Using a rescue inhaler more than twice a week suggests poor control. The ACT captures this pattern.
  • “Asthma is just a childhood disease.” — Asthma affects all ages. Adult‑onset asthma is common and requires the same diligent control assessment.
  • “If I feel fine, I can stop my controller medication.” — Controller medications reduce inflammation and prevent exacerbations. Stopping them without medical advice can lead to loss of control.

Practical Tips for Better Asthma Control

  • Track your symptoms: Use a diary or app to record symptoms, peak flow, and medication use.
  • Review inhaler technique: Improper technique is a common cause of poor control. Ask your provider or pharmacist to check your technique.
  • Identify and avoid triggers: Common triggers include allergens, smoke, cold air, and exercise. Use an action plan to manage exposure.
  • Adhere to controller therapy: Take your prescribed controller medication daily, even when you feel well.
  • Regular follow‑up: Schedule regular check‑ups with your healthcare provider, even when symptoms are stable.

Frequently Asked Questions

The ACT is designed for adults and adolescents aged 12 years and older with a diagnosis of asthma. It is suitable for use in clinical settings, pharmacies, and for self‑monitoring at home.

The ACT is typically administered every 4 weeks for routine monitoring, or more frequently if symptoms are changing. Many asthma action plans include weekly or monthly ACT scoring.

A separate version, the Childhood Asthma Control Test (c‑ACT), is validated for children aged 4–11 years. This tool is for adolescents and adults (12+).

The ACT is intended for individuals with a confirmed asthma diagnosis. If you have respiratory symptoms but no diagnosis, please consult a healthcare professional for proper evaluation.

A low ACT score (≤ 19) indicates poor control. Schedule an appointment with your healthcare provider as soon as possible. They can review your medications, inhaler technique, and triggers, and adjust your management plan accordingly.

Authoritative resources include the GINA website, the American Lung Association, and the Asthma UK website. Always consult your healthcare provider for personalized advice.

Evidence‑based and clinically grounded – This tool is based on the validated Asthma Control Test (ACT) developed by the University of Toronto and endorsed by GINA. The scoring algorithm and interpretation follow established clinical guidelines. References include Schatz et al. (2006), the GINA 2024 report, and the American Thoracic Society clinical practice guidelines. Reviewed by the GetZenQuery tech team, last updated July 2026.

References: GINA 2024 Report; Schatz M, et al. “Asthma Control Test: reliability, validity, and responsiveness in patients not previously followed by asthma specialists.” J Allergy Clin Immunol. 2006; Nathan RA, et al. “Development of the asthma control test: a survey for assessing asthma control.” J Allergy Clin Immunol. 2004; ATS Clinical Practice Guidelines.