Screening by itself does not change what happens next
Across 16 randomised trials in 7,576 patients, giving clinicians a depression questionnaire raised recognition a little and changed outcomes not at all: "little or no impact". What changes outcomes is what is built around the score.
We have not finished checking this source. No judgement either way. how we score evidence
Caveat on this rating: The trials pooled here predate most collaborative-care programmes; the USPSTF's B grade rests on evidence that screening programmes with support improve outcomes, which is not in conflict with Gilbody's null for screening alone. Both are stated. Neither shows that screening harms.
Significant findings
The Cochrane group led by Simon Gilbody pooled 16 randomised trials, 7,576 patients, in which depression questionnaires were administered and the results fed back to clinicians. Recognition of depression rose modestly (relative risk 1.27, 95% confidence interval 1.02 to 1.59), but when questionnaires were given to everyone and results returned regardless of score, recognition did not move (1.03, 0.85 to 1.24). Antidepressant prescribing did not change (1.20, 0.87 to 1.66). In the seven trials that measured outcomes, the effect on depression was nil (standardised mean difference -0.02, -0.25 to 0.20). Their conclusion: "If used alone, case-finding or screening questionnaires for depression appear to have little or no impact on the detection and management of depression by clinicians. Recommendations to adopt screening strategies using standardized questionnaires without organizational enhancements are not justified." The Cochrane review put it harder: "Practice guidelines and recommendations to adopt this strategy, in isolation, in order to improve the quality of healthcare should be resisted."
The other half. The US Preventive Services Task Force still recommends screening adults for depression, a B grade, "moderate net benefit", in its 2023 statement; it found the evidence insufficient for suicide-risk screening. The difference between the two findings is the word "alone". Medicare's coverage decision reads the same way: annual screening is covered "when staff-assisted depression care supports are in place to assure accurate diagnosis, effective treatment, and follow-up", defined at minimum as clinical staff who "can advise the physician of screening results and who can facilitate and coordinate referrals to mental health treatment". And a 2017 review of measurement-based care found that "Ineffective approaches included one-time screening, assessing symptoms infrequently, and feeding back outcomes to providers outside the context of the clinical encounter."
Worth asking
The evidence supports a screen attached to a system that acts on it. It does not support a form on a clipboard. Which one is yours?
Source
Screening and case-finding instruments for depression: a meta-analysis — Gilbody S, Sheldon T, House A (2008)
Read the source: https://doi.org/10.1503/cmaj.070281
DOI: 10.1503/cmaj.070281
How this was scored
- Study design
- not recorded
- Funding
- not recorded
- Published in
- not recorded
- Sample size
- not recorded
- Preregistered
- not recorded
- Conflicts disclosed
- not recorded
- Independent of proponent
- not recorded
- Retracted
- No
We have not finished checking this source, so there is no scoring to show yet. “We have not checked this yet” and “this is disputed” are different statements, so no scored band is shown rather than a low one.
Read the full scoring rubric, including what it can't tell you.
Published September 15, 2026.
Questions
How strong is the evidence behind this?
veisund rates this source "not yet assessed". We have not finished checking this source. No judgement either way. One caveat travels with that badge: The trials pooled here predate most collaborative-care programmes; the USPSTF's B grade rests on evidence that screening programmes with support improve outcomes, which is not in conflict with Gilbody's null for screening alone. Both are stated. Neither shows that screening harms. The score is calculated from recorded facts about the source — study design, funding, publication venue, sample size, preregistration — not typed in by an editor.
What is the source for this?
Screening and case-finding instruments for depression: a meta-analysis — Gilbody S, Sheldon T, House A (2008). DOI: 10.1503/cmaj.070281. The full source is linked on this page so you can read it yourself.
Is this medical advice?
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.
This is information to bring to your prescriber, not medical advice and not a reason to change anything on your own. Nothing here is an instruction to stop or reduce a medication. If you are in crisis, call or text 988.