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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Diagnostic overshadowing and reasonable adjustments

Psychiatry · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Behaviour change may signal serious illness

Withdrawal, agitation, self-injury, reduced eating, loss of mobility or altered communication can be the presenting signs of pain, sepsis, hypoxia, hypoglycaemia, seizure, stroke, bowel obstruction, injury or abuse in a person who cannot describe symptoms conventionally.

Action: Establish the person's baseline, perform an adjusted ABCDE assessment with observations and glucose, examine for pain and injury, seek knowledgeable collateral, and activate the same urgent pathway the findings would require in any patient.

Synopsis

Recognise new illness without attributing symptoms to disability, identify the environmental barriers that obstruct equitable care, and implement specific reasonable adjustments before assessment, treatment and follow-up.

  • Diagnostic overshadowing means attributing physical, emotional, behavioural or social change to a learning disability or existing condition while overlooking another explanation.
  • Ask the person and supporters what normal looks like; changes in facial expression, vocalisation, routine, function or interaction may be the equivalent of a symptom history.
  • Use ordinary clinical reasoning and red-flag thresholds, then adapt how assessment is delivered rather than lowering its diagnostic standard.
  • Reasonable adjustments remove substantial disadvantage and may include longer appointments, quiet waiting, familiar staff, Easy Read information, interpreters, desensitisation visits, accessible equipment or a supporter chosen by the person.
  • Record the exact adjustment, flag it visibly, share it through lawful referrals and handovers, and verify before the next encounter that the receiving service can act on it.
  • Consent and capacity principles still apply: a supporter can aid communication but does not automatically answer for an adult or authorise treatment.
  • Escalate persistent access failures through learning-disability liaison, service leadership, patient-safety and safeguarding routes when they create ongoing harm.

Key red flags

A marked departure from usual behaviour, sleep, appetite, continence, gait, communication or participation is clinical data and must not be dismissed as learning disability or autism.

Carer concern that a person is not themselves deserves direct assessment, especially when the person has limited speech or atypical pain expression.

Repeated failed appointments, incomplete investigations or inability to tolerate a standard environment indicate a service-access problem requiring adjustment, not automatic refusal of care.

Sedation or restraint used to overcome avoidable environmental barriers can conceal deterioration and introduce respiratory, injury and human-rights risk.

Investigation priorities

01
Baseline and change historyFirst step

Separate lifelong traits from a new symptom, functional loss or environmental response.

Management branches

New presentationStart from change, not label

A person with a disability develops new symptoms, behaviour or functional loss.

  1. Ask the person and appropriate supporters to describe the usual baseline, precise change, time course and any setting-specific pattern using accessible communication.
  2. Complete observations, examination, medication review and targeted investigations with adjustments while applying standard red-flag and escalation thresholds.
  3. Record a working differential and safety net in a form the person and support network can understand, naming who will act on results.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • NICE NG96 learning-disability care recommendationsDiagnostic overshadowing, health surveillance, communication and recorded reasonable adjustments.
  • NHS England Accessible Information Standard implementationSix-step process for communication needs and accessible service delivery.
  • NHS England Reasonable Adjustment Digital FlagNational recording and sharing of individual reasonable adjustments.
  • Equality Act 2010 section 20Core statutory reasonable-adjustment duty in Great Britain.
  • Equality Act 2010 Schedule 2Service-provider application of the anticipatory reasonable-adjustment duty.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom