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© 2026 Heidi. All rights reserved.

Heidi Desktop goes where the browser can’t.

Dictate anywhere on your screen, capture telehealth audio straight from the call,
and skip the second login.

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Warning: Clinical review pending: not for clinical use

Before you score. A self-report screener, not a diagnostic instrument. Scores over the past 2 weeks; interpret alongside clinical interview.

01

Little interest or pleasure in doing things

02

Feeling down, depressed, or hopeless

03

Trouble falling or staying asleep, or sleeping too much

04

Feeling tired or having little energy

05

Poor appetite or overeating

06

Feeling bad about yourself, or that you are a failure, or have let yourself or your family down

07

Trouble concentrating on things, such as reading the newspaper or watching television

08

Moving or speaking so slowly that other people could have noticed — or the opposite: being so fidgety or restless that you have been moving around a lot more than usual

09

Thoughts that you would be better off dead, or of hurting yourself in some way

For clinical decision support only. Always integrate with full clinical assessment, local guidelines, and patient preferences.

PHQ-9 Score

0/ 27
Minimal or no depression

Minimal or no depressive symptoms.

Use alongside

GAD-7

Kroenke K, Spitzer RL, Williams JBW. The PHQ-9: validity of a brief depression severity measure. J Gen Intern Med. 2001;16(9):606-613.

Trusted by clinicians worldwide. Supporting 2.7 million patient visits weekly.
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Wilmington Health logo
Cambridge Memorial Hospital logo
Jane Pauley Community Health Center logo
Sensible Care logo
Strive Health logo
New Brunswick Media Society logo
DMC Primary care logo
Airrosti logo
Wilmington Health logo
Cambridge Memorial Hospital logo
Jane Pauley Community Health Center logo
Sensible Care logo
Strive Health logo
New Brunswick Media Society logo
DMC Primary care logo
Airrosti logo
Wilmington Health logo
Cambridge Memorial Hospital logo
Jane Pauley Community Health Center logo
Sensible Care logo
Strive Health logo
New Brunswick Media Society logo
DMC Primary care logo
Airrosti logo
Heidi Tools

PHQ-9 Calculator

PHQ-9 (Patient Health Questionnaire-9) is a validated 9-item clinical tool used to screen for, diagnose, and monitor the severity of depression, with scores ranging from 0 to 27.

Heidi Evidence

Got the severity score? Now map it to the evidence.

Heidi Evidence uses comprehensive patient context alongside full session data to resolve clinical questions, empowering you to make informed decisions backed instantly by reliable sources.

Explore Evidence

Fast, objective severity scoring when it matters most

Ask a scoring question and Evidence returns the result with the logic and sources attached, for you to assess and approve.

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Advantages of Using Heidi Evidence

Every answer opens to its source

Every summary carries citations with verbatim excerpts from the source, so you can open it, read it in context and confirm it says what the answer claims. What surfaces are decided by clinical quality, the governed alternative to pasting a clinical question into a general AI chatbot and hoping the answer holds.

Guidance that fits where you practice

Heidi Evidence draws on sources clinicians already trust, from Elsevier and DynaMed to MIMS Australia, and your organization can layer in its own regional pathways, policies, and formularies.

Built safe to give you sound ground

Heidi is the first in its field to hold ISO 42001 certification for AI management. Since Evidence is designed as a reference tool, the clinical call (and the responsibility for it) stays with you.

The context comes with the question

Evidence draws on the patient visit and its context, so the specifics travel with the question instead of being left behind. When a calculation is involved, the logic sits alongside the result, so you can see how it was reached and confirm it yourself rather than trust a black box.

Testimonials from Clinicians Using Heidi Evidence

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“Evidence lets me take those basic recommendations and back them with proper sources, so the GP understands where I'm coming from.”

Making that connection between the patient and the GP, like a puzzle fitting together.

Deborah Hawthorne

Consultant Pharmacist
“Keeping up with evidence is so important for our profession... [With Heidi Evidence] You have that information available on the spot, which for me was quite valuable, and it's been pretty accurate as well.”

Clinicians at Connect2Care

PHQ-9 Calculator Key Points

Medical knowledge only. Not for autonomous decision making. Check sources and use your clinical judgement.

A PHQ-9 score of 10 or higher marks the threshold for starting active treatment with pharmacotherapy, psychotherapy, or both. Management follows a stepped-care model: 5-9 calls for watchful waiting and a repeat PHQ-9 at follow-up, 10-14 warrants pharmacotherapy or psychotherapy, 15-19 calls for active treatment with pharmacotherapy and/or psychotherapy, and 20-27 requires immediate pharmacotherapy with an expedited specialist referral.

Any response of 1 or higher on item 9, indicating passive or active suicidal ideation on any days in the past 2 weeks, requires a formal suicide risk assessment by a competent clinician before proceeding with routine management, regardless of the total PHQ-9 score.

Clinicians should reassess every 4-6 weeks. Remission is defined as a score of 4 or below. A reduction of fewer than 5 points and less than 25% from baseline at 6 weeks should prompt consideration of treatment switching or augmentation.

SSRIs and SNRIs remain first-line pharmacotherapy across major guidelines, and an antidepressant trial needs 6 to 8 weeks at a therapeutic dose before non-response can be concluded.

Showing 5 of 6 questions
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