ISI · 3 minutes
Insomnia severity index (ISI)
Reflect on the past 2 weeks. The Insomnia Severity Index categorises sleep difficulty from no insomnia to clinical severe insomnia, and tells you whether intervention is warranted.
Difficulty falling asleep — how severe?
Educational tool — not a diagnosis. Insomnia Severity Index (ISI), Bastien et al. 2001. Widely used in sleep medicine clinical trials and practice.
Frequently asked
Plain-language answers about insomnia, this screener, and what evaluation costs at a Class A hospital in China.
- What's a clinically significant ISI score?
- 0–7 no clinically significant insomnia, 8–14 subthreshold, 15–21 moderate clinical, 22–28 severe. A score of 15 or higher generally warrants treatment.
- What treats chronic insomnia best?
- CBT-I (cognitive behavioural therapy for insomnia) is first-line and has the strongest long-term evidence. Pharmacotherapy is short-term adjunctive. TCM (suanzaoren-based formulas, acupuncture) has evidence for mild-to-moderate insomnia.
- What does an insomnia workup cost?
- Sleep medicine consult plus actigraphy at a Class A hospital is typically $140–240. A formal in-lab polysomnography (when sleep apnoea is suspected) is $260–420 — vs $1,500–3,000 in the US.
About this screener
Insomnia Severity Index (ISI), Bastien et al. 2001. Widely used in sleep medicine clinical trials and practice.
What this screener covers
- Insomnia disorder(ICD-10 F51.01)
Validated source
Medical review
Reviewed by Panda Touring Care medical team (Sleep medicine coordinator review) · last reviewed 2025-04-01
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