Assessment for new psychosis in later life (Late-onset and very late-onset psychosis assessment)
A careful specialist assessment for an older adult who has developed new hallucinations, delusions or suspiciousness, to find the cause and the safest way to help.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- New hallucinations, delusions or suspiciousness in later life always deserve a proper assessment — they are not just "old age".
- Many causes are medical or reversible (such as delirium, infection, medicines, dementia, stroke, or sight and hearing loss), so a physical check, blood tests and often a scan are part of the assessment.
- A primary mental illness is diagnosed only after other causes are looked for, so the diagnosis can take time and may change.
- If there is any risk of harm to the person or others, this is urgent — call 999 in an emergency. In a crisis without immediate danger, call 111 and choose the mental health option if you are in England, Scotland or Wales; in Northern Ireland call Lifeline free on 0808 808 8000 or your GP out-of-hours service. The Samaritans are also available free on 116 123.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your psychiatrist will give you advice for your situation.
Finds reversible causes — such as infection, medicines, thyroid or vitamin problems — that can sometimes be put right.
When symptoms have come on suddenly with confusion or physical illness — this suggests delirium and needs urgent medical, not routine, assessment.
The person and, with consent, a relative talk with the clinician, who also checks physical health and arranges tests. It can feel intense or upsetting.
A clear explanation of the likely cause and an honest account of any uncertainty.
The person and, with consent, a relative talk with the clinician, who also checks physical health and arranges...
The clinician gives an early impression, makes sure the person is safe, and may start treatment for anything...
Blood tests and scan results come back. Treatment of reversible causes may already be helping. A clearer diagnosis...
If a primary mental illness is likely, treatment is reviewed and adjusted. The team watches how symptoms and any...
What is an assessment for new psychosis in later life?
Psychosis means losing touch with what is real — for example, hearing or seeing things that are not there, holding fixed beliefs that are not true (such as believing people are stealing or plotting), or becoming very suspicious. When this starts for the first time in later life, it needs a careful assessment, because the cause matters enormously for what helps.
The purpose of the assessment is to find out what is driving the symptoms. In older adults, new psychotic symptoms are often caused by something other than a primary mental illness — for example delirium from an infection or medicines, dementia, a stroke, sight or hearing loss, thyroid problems, vitamin deficiency, alcohol, or a side effect of a drug. Primary psychiatric causes, such as very late-onset schizophrenia-like psychosis, severe depression or bipolar disorder, are real but are diagnosed only after these other causes have been looked for.
Because of this, a primary psychosis is described as a "diagnosis of exclusion": the clinician must first rule out medical and brain causes. The assessment therefore combines a mental health interview with a physical check, blood tests and often a brain scan.
The aim is not to label someone, but to understand what is happening, treat anything reversible, reduce distress and keep the person safe — while being honest that the cause is sometimes not clear straight away.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Full psychiatric interview
A detailed conversation about the experiences, when they started, how they affect daily life, mood, sleep, alcohol, and any risk to the person or others.
Collateral history
Talking, with consent, to family or carers who can describe what they have noticed and how things have changed over time — often vital when insight is limited.
Physical and cognitive examination
A check of physical health, hearing and eyesight, and short thinking tests, because delirium, dementia and sensory loss are common contributors.
Investigations
Blood tests, urine tests and often a brain scan (CT or MRI) to look for infection, thyroid, vitamin, electrolyte or structural causes.
Preparing for your test
- Bring all medicines, including recently started, stopped or over-the-counter ones, as many can trigger or worsen psychosis.
- Wear glasses and hearing aids, as poor sight and hearing can cause or worsen symptoms in later life.
- If you can, bring someone who knows the person well to describe what has changed and when.
- Make a note of when the symptoms started and whether they came on suddenly (over hours or days) or gradually.
- Mention any recent illness, infection, fall, alcohol use or new medicines.
- Bring a list of past medical and mental health problems and any previous clinic letters.
- If the person is very distressed or at risk, do not wait for a routine appointment — seek urgent help.
What happens
An older-adult mental health specialist (a psychiatrist) or their team will talk with the person, and usually with a relative or carer too. They will ask gently about the experiences — what is heard, seen or believed — and about mood, sleep, memory, alcohol and any thoughts of harm. They will check physical health, hearing and eyesight, and may do short memory and thinking tests.
Because many causes are physical, the clinician usually arranges blood tests and often a brain scan, and reviews all current medicines. They will form an early impression, but may explain that a clear diagnosis depends on the results and sometimes on watching how things change over time.
The assessment also looks carefully at risk and at the person's circumstances, including isolation and how they are managing at home. With consent, the clinician will explain the plan; if the person lacks the capacity to make a particular decision, the team works in their best interests under the law.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- When symptoms have come on suddenly with confusion or physical illness — this suggests delirium and needs urgent medical, not routine, assessment.
- When there is immediate risk of harm to the person or others — this is an emergency, not a routine clinic appointment.
- As a stand-alone mental health assessment without any physical examination, blood tests or scan.
- When a private outpatient route cannot manage the level of risk involved safely.
Delay or rearrange if…
- There is an untreated infection or acute illness clouding the picture — treat and reassess.
- A recently started or stopped medicine may be the cause and can be reviewed first.
- Hearing aids or glasses are missing and could change the assessment.
- The person is too distressed or unsafe for an outpatient assessment and needs an urgent or crisis route instead.
Alternatives to discuss
- Urgent medical assessment first if delirium or a physical cause is likely.
- Referral to an NHS older-adult mental health team for a full multidisciplinary assessment.
- Treating reversible contributors — infection, medicines, sensory loss, isolation — and then reviewing.
- Memory clinic assessment if dementia is the more likely explanation.
- Crisis or home-treatment team involvement when risk is high.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Finds reversible causes — such as infection, medicines, thyroid or vitamin problems — that can sometimes be put right.
- Separates delirium, dementia and primary mental illness, which need very different treatment.
- Reduces distress by understanding and naming what is happening.
- Identifies and manages risk to the person and to others.
- Picks up treatable sensory problems, such as hearing loss, that can worsen symptoms.
- Guides safe treatment, including which medicines are risky in conditions such as Lewy body dementia.
Risks & complications
- Feeling frightened, upset, suspicious or reluctant during the assessment.
- Diagnostic uncertainty at first, with the picture becoming clearer only over time.
- Needing several appointments and tests before there is an answer.
- Distress or mistrust if the person does not believe anything is wrong.
- Worry about who sees the information and what it means for independence or driving.
- Side effects if medicines are started — especially in older adults and in Lewy body dementia.
- A serious reaction to antipsychotic medicines in people with Lewy body or Parkinson's disease dementia, who can be very sensitive to them.
- A missed physical cause if the assessment is rushed or incomplete.
The biggest risk is missing a treatable physical or brain cause, so insist that physical health, medicines, and often a scan are all considered — not just the mental health symptoms. If antipsychotic medicines are suggested, ask whether Lewy body dementia has been thought about, because people with it can react very badly to these drugs. Ask what is being done to keep the person safe in the meantime.
Published figures to discuss
There are no meaningful complication rates for the assessment itself. The important numbers are about uncertainty: a primary psychosis in later life is a diagnosis of exclusion, so early impressions are sometimes revised, and a proportion of people with very late-onset psychosis go on to develop dementia over the following years. Published estimates of how often this happens vary between studies and depend heavily on how groups are defined, so they are best discussed individually rather than quoted as a single figure.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Delirium, dementia or physical illness missed | Common in late-onset symptoms | New hallucinations or delusions in later life should trigger medical, cognitive and medication review. | Guide sourcesClinical context |
| Medication side effects | Higher in older adults | Antipsychotics can cause falls, sedation, parkinsonism, metabolic effects and QT/cardiovascular risks. | Very late-onset schizophrenia-like psychosis and dementia risk — PMC cohort studyncbi.nlm.nih.govSource-linked context |
| Risk from persecutory beliefs | Patient-specific | Self-neglect, confrontation with neighbours, refusal of care or unsafe driving may require urgent action. | Very late-onset schizophrenia-like psychosis and dementia risk — PMC cohort studyncbi.nlm.nih.govSource-linked context |
| Lewy body dementia sensitivity missed | Important if visual hallucinations/parkinsonism/fluctuation | DLB can cause severe antipsychotic sensitivity, so diagnosis matters before prescribing. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery from the assessment itself. "Afterwards" means understanding the likely cause, starting any treatment, and agreeing how to keep the person safe and supported.
- Feeling tired, exposed or upset after talking about frightening experiences.
- Not fully accepting the explanation at first.
- Waiting a while before the cause is clear.
- Symptoms easing as a reversible cause is treated, or as medicines take effect over weeks.
Aftercare
- Make sure any physical cause that was found is being treated and followed up.
- If medicines are started, ask about side effects, how long before they help, and when they will be reviewed.
- Keep glasses and hearing aids in good working order, as this genuinely helps.
- Reduce isolation where possible, with family contact or community support.
- Keep a named contact for questions and for getting help quickly if things get worse.
- Attend follow-up so the diagnosis and treatment can be checked over time.
- Have a clear plan for what to do in a crisis, including who to call.
- All medicines and supplements gathered for review
- Glasses and hearing aids working and to hand
- Notes on when symptoms started and how they have changed
- A relative or carer who can give their account, with consent
- Previous medical and mental health letters
- Crisis contacts saved: 999; 111 mental health option (England, Scotland, Wales) or Lifeline 0808 808 8000 (Northern Ireland); Samaritans 116 123
⚠ Get urgent help if…
- Any thoughts or threats of harming themselves or others — call 999 if there is immediate danger.
- Acting on frightening beliefs or voices, for example trying to flee, hide or confront someone.
- Sudden confusion, drowsiness or a fast change over hours or days — this can be delirium and needs urgent medical help.
- New weakness, facial drooping, slurred speech or loss of vision — call 999, as these can be signs of a stroke.
- Fever, not drinking, or becoming physically unwell alongside the symptoms.
- After starting an antipsychotic: high fever, stiffness, severe drowsiness or confusion — seek urgent medical help, as this can signal a serious reaction.
- In a mental health crisis without immediate danger: in England, Scotland or Wales call 111 and select the mental health option; in Northern Ireland call Lifeline free on 0808 808 8000 or your GP out-of-hours service. The Samaritans are also there free, day or night, on 116 123.
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your psychiatrist gives you.
Results & realistic expectations
A good assessment gives the person and their family an explanation they can understand, treats anything reversible, and sets out a clear, safe plan. Sometimes the cause is found quickly — for example an infection or a medicine. Often, especially when dementia or a primary mental illness is involved, the picture becomes clear only over weeks as tests return and the response to treatment is seen.
An assessment cannot promise a single, fixed answer straight away, and the diagnosis can change as more is learned. What it can do is rule out dangerous and treatable causes, reduce distress and risk, and make sure any treatment is as safe as possible for an older person.
A first assessment is a starting point, not the final word. Diagnoses in later-life psychosis can evolve — for example, what looks like a primary psychosis may later prove to be early dementia. Because of this, plans are reviewed over time, and any medicines started are reassessed regularly for benefit, side effects and whether they are still needed.
Related tests, treatments or support
Assessment for late-life psychosis is usually combined with a physical and medication review, blood and urine tests, often a brain scan, and checks of hearing, eyesight and thinking. If dementia or delirium is suspected, it links closely with memory assessment and delirium care; if mood is involved, with assessment and treatment of depression or bipolar disorder.
Follow-up & long-term care
Follow-up is arranged to check test results, review the diagnosis, see how the person is responding, and watch for medication side effects. The interval depends on how unwell and how safe the person is. A named contact and a crisis plan should be in place so help can be reached quickly between appointments.
- Regular review of any antipsychotic or other medicines for benefit, dose, side effects and whether they can be reduced or stopped.
- Keeping hearing and eyesight corrected, as this can reduce symptoms.
- Ongoing support to reduce isolation and keep the person engaged and safe.
- Monitoring for dementia developing over time, as later-life psychosis can be an early sign.
Repeat, follow-on and what comes next
- The diagnosis often becomes clearer, and sometimes changes, as test results return and symptoms are followed over time.
- What first looks like a primary psychosis can later prove to be early dementia.
- Treatment, especially medication, is commonly adjusted as response and side effects become clear.
- Repeat assessment is normal rather than a sign that the first assessment failed.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear explanation of the likely cause and an honest account of any uncertainty.
- Treatment of any reversible cause, with follow-up to check it has worked.
- Careful, low-dose, regularly reviewed medication only when needed, with attention to Lewy body sensitivity.
- A named contact and a written crisis plan, including 999, the 111 mental health option (England, Scotland or Wales) or Lifeline 0808 808 8000 (Northern Ireland), and Samaritans 116 123.
- Ongoing review of the diagnosis, treatment response and the person's safety and support at home.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- The length and number of appointments needed to reach a clear picture.
- Whether a collateral history from family or carers is included.
- The blood tests and brain scan (CT or MRI) arranged as part of the assessment.
- Whether physical examination and cognitive testing are included.
- The complexity of any written report or letter to the GP.
- Whether ongoing follow-up and medication review are part of the package.
- How many appointments are expected and what each includes.
- Whether blood tests and a brain scan are included or charged separately.
- Who carries out the assessment and their experience with older adults.
- Whether a collateral history and physical examination are included.
- What written report or GP letter is provided.
- What follow-up, medication review and crisis support are included.
- What happens, and what it costs, if the diagnosis is unclear and more tests are needed.
On the NHS? Assessment for new psychosis in later life is available on the NHS through GPs, memory services and community mental health teams; private assessment may be used for speed or choice, but urgent or risky situations should go through NHS emergency routes.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Treating symptoms with medication before looking for a physical or brain cause.
- Not involving family for a collateral history, or not explaining who sees the information.
- Not discussing the higher risks of antipsychotics in older adults and in Lewy body dementia.
- Not setting out a safety plan and who to contact in a crisis.
- Assuming the person cannot be involved in decisions without assessing their capacity for that specific decision.
Marketing red flags
- Promising a quick, definitive diagnosis in a single private appointment.
- Offering medication without physical assessment, blood tests or a scan.
- Downplaying the risks of antipsychotic medicines in older adults.
- Treating later-life psychosis as a simple problem with a one-size-fits-all answer.
Choosing a specialist safely
- Check the psychiatrist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the psychiatrist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good psychiatrist will welcome every one of these.
- What do you think is causing these symptoms, and how sure are you?
- Have physical causes — infection, medicines, thyroid, stroke, dementia — been checked?
- Could hearing or eyesight loss be making this worse, and can that be treated?
- If medication is suggested, what are the risks in an older person, and has Lewy body dementia been considered?
- How will you keep my relative safe in the meantime, and who do we call in a crisis?
- When will the diagnosis and treatment be reviewed?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the psychiatrist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Is this just a normal part of getting older?
Why do they want blood tests and a scan for a mental health problem?
Will they put my relative on strong medication straight away?
What if my relative does not think anything is wrong?
Could hearing loss really cause this?
What should I do if it becomes an emergency?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: Royal College of Psychiatrists — Psychosis NHS — Psychosis NHS — Where to get urgent help for mental health Late-onset and very late-onset psychosis: possible aetiologies — PMC review Very late-onset schizophrenia-like psychosis and dementia risk — PMC cohort study nidirect — urgent and emergency care (Northern Ireland) nidirect — GP out-of-hours service (Northern Ireland) NHS England — NHS 111 mental health crisis support NHS inform Scotland — urgent mental health help NHS 111 Wales — mental health and wellbeing nidirect — mental health emergency / Lifeline (Northern Ireland)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
Related guides: Psychosis and schizophrenia management · Delirium (acute confusion) assessment · Dementia diagnosis · Memory and cognitive assessment · Depression in older adults