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Screening versus diagnosis: what is the difference?

Screening and diagnosis are different things, and confusing them causes a lot of unnecessary worry.

What screening does

A screening tool is a short questionnaire that indicates whether a fuller assessment might be worthwhile. It is a signpost. It cannot diagnose, and a high score is not a diagnosis.

What a diagnostic assessment does

A diagnostic assessment is a structured clinical conversation with someone qualified to interpret it, covering your history, your current functioning and the alternative explanations. It produces a clinical opinion.

Why the distinction matters

Online questionnaires are widely available and are not regulated. They can be a useful prompt to seek an assessment. They are not a substitute for one, and they should not be used to rule a possibility out.

Where to go next

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