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Classification & Assessment in Psychiatry · Paper A

Dynamic (changeable) risk factors in risk assessment

The idea

Static risk factors describe who someone has been; dynamic risk factors describe who they are right now. A risk assessment is really two separate questions. The first is a baseline question: what is this person's long-run risk, built from facts that will never change, for example age at first contact with services, sex, or a childhood history of abuse? The second is a change question: how has that baseline shifted because of something happening this week, such as active drinking, a stopped depot injection, new command hallucinations, or a partner walking out? Structured tools such as the HCR-20 build this split into their own name, with Historical items static and Clinical and Risk management items dynamic. In practice this means a care plan that only ever restates someone's history has nothing left to intervene on. The exam question is almost never 'is this a risk factor' — it is whether the feature described could plausibly be different by the next ward round.

How it works

Static risk factors are fixed historical facts or immutable characteristics — once true, always true (sex, age at first contact with services, a past conviction, a childhood history of abuse). No treatment can change them; they exist only to set a long-term, baseline estimate of risk.
Dynamic risk factors are state-dependent and genuinely changeable. They are present because of something happening in a person's CURRENT clinical or social state — active substance use, non-adherence with medication, an acute symptom relapse, a social crisis. Their contribution to risk rises when that state is present and falls when it resolves.
The practical test for which category a feature belongs to: could a treatment plan, a support package, or simply the passage of time make this different by the next review? If yes, it is dynamic; if the honest answer is that it already happened and can't be undone, it is static.
Structured professional judgement tools operationalise this split directly — the HCR-20 (Historical, Clinical, Risk management) names its three item sets after exactly this distinction, with the H items static and the C and R items dynamic.
Only dynamic factors are legitimate targets for a care plan or a change in observation level; static factors inform the baseline risk category a person sits in but cannot themselves be treated.
A person's risk LEVEL can rise or fall over time, sometimes sharply, purely because their dynamic factors have changed, even though every static fact about them stays the same.

How to spot it

A vignette describing something that 'has started', 'has stopped', 'over the past days/weeks', or 'has changed since the last review' is naming a dynamic risk factor.
A vignette describing a fixed fact — sex, age, a date, a diagnosis made years ago, a total count of past events — with no suggestion it is new or changing is naming a static risk factor.
A vignette that explicitly states certain features are 'unchanged' or 'as before' is telling you to rule those options out and look for the one feature that has genuinely moved.
A vignette combining a dramatic historical detail (a violent conviction, childhood abuse) with a quieter recent change (resumed drinking, a stopped injection) is testing whether you can resist the salience of the history and correctly identify the changeable feature.
An EMI-style vignette naming a diagnosis 'made ten years ago, unchanged at every review' is pointing at a static option even though it is a clinical/psychiatric fact, not a demographic one.

Tell it apart

Changeabilitydynamic factors CAN change with treatment or time (substance use, adherence, acute symptoms, social crisis) vs static factors that CANNOT (sex, age at first contact, childhood history, a past conviction).
Tool structurethe HCR-20's Historical (H) items are static vs its Clinical (C) and Risk management (R) items are dynamic — the same tool codes both, but the letter tells you which kind.
Clinical usedynamic factors are what a care plan actually intervenes on, whereas static factors only set the baseline risk category a person starts from.
Diagnosis vs symptomsa diagnostic LABEL such as antisocial personality disorder is coded static (the label itself doesn't come and go) vs an acute SYMPTOM such as new command hallucinations is dynamic, even though both sit inside the same person's mental state.
Recency is not the testa conviction from last month is still static (it already happened and is fixed forever) unlike an ongoing behaviour such as current heavy drinking, which remains dynamic for as long as it continues.
Directiondynamic factors can move risk UP or DOWN across repeated assessments of the same person, whereas static factors contribute the same fixed amount at every assessment.

Watch for

Assuming 'severe' automatically means 'dynamic' — a past violent conviction is severe but permanently static; an acute change in mental state can be dynamic even when it looks less dramatic on paper.
Treating a diagnosis (e.g. antisocial personality disorder) as dynamic just because the person's day-to-day behaviour visibly fluctuates — the diagnostic label itself is what structured tools code, and that label is static.
Mistaking recency for changeability — an event that happened last week (a conviction, an admission) is still a fixed historical fact once it has occurred, not a dynamic factor.
Filing a social or relational crisis under 'background/social history' as though it were static, when a RECENT loss of support is a genuinely fluctuating, interveneable circumstance.
Picking the most dramatic feature in a vignette rather than the one that has actually CHANGED since the last assessment — command hallucinations, non-adherence and a relationship breakdown can all appear in the same stem, and only the one described as new or changed is the answer being tested.
Forgetting that a fixed diagnosis and a fluctuating symptom can coexist in the same person — sorting by category (label vs current state), not by drama, resolves this.

Use it again

First askcould this specific feature plausibly be different at the next assessment? If yes, it is dynamic; if the answer is that it already happened and cannot be undone, it is static.
When a stem lists several features, actively look for the words 'unchanged', 'as before' or 'longstanding' — these are the stem telling you which options to exclude.
When a diagnosis and a symptom both appear, separate the fixed LABEL (static) from the fluctuating CURRENT STATE (dynamic) — do not let the diagnosis's own severity make you call it dynamic.
When a historical event is described with emotionally loaded detail (abuse, violence, a criminal record), don't let its seriousness pull you away from checking whether it is fixed — seriousness and changeability are independent axes.
If several genuinely dynamic-sounding options are offered, match each one to the specific recent change the vignette actually describes, rather than picking whichever dynamic factor is most familiar.
For an EMI theme mixing static and dynamic answers, read each vignette for its own timeframe cue (recent change vs longstanding fact) before matching it to the option list.

In detail

Hook — the same man, two different Tuesdays

Picture the same man assessed twice, six months apart. Nothing about his date of birth, his sex, or the conviction on his record has changed — those facts are frozen in time. But the second assessment rates him as far higher risk than the first, because two weeks ago he stopped taking his depot injection (a slow-release form of antipsychotic medicine given by injection every few weeks) and has started drinking heavily again. Same person, same fixed history — a completely different risk level. This page is about the two kinds of fact that make that possible: the ones that never move, and the ones that do.

Plain definition

In risk assessment (used for violence, self-harm and suicide alike), every risk factor sorts into one of two boxes. A STATIC risk factor is a fixed fact about a person's past or biology — something that has already happened, or something that simply is, and can never be otherwise. A DYNAMIC risk factor is state-dependent (meaning it depends on the person's CURRENT clinical or social situation) — it is present today because of something happening now, and it can genuinely be different tomorrow.

The critical caveat — severity is not the test

Here is the trap almost everyone falls into: assuming the most severe-sounding fact in a case must be the important, actionable one. It does not work that way. A previous conviction for a violent offence is serious, and permanently static; nothing a clinician does this week changes the fact that it happened. Meanwhile, a quiet, easily-missed detail — he has not collected his depot injection for six weeks — is dynamic, and it is the one thing a care team can actually act on before the next assessment. Severity and changeability are two completely separate questions, and an exam vignette will often hand you a dramatic static fact specifically to see whether you notice the quieter dynamic one instead.

First principles — why the split exists at all

Think of risk the way you would think about deciding whether to carry an umbrella. A city's geography — its latitude, its coastline, whether it sits in a rain shadow (an area that a mountain range blocks most rain clouds from reaching) — sets that city's long-run climate, its baseline chance of rain over a whole year. That geography is fixed; it was decided millions of years ago and no decision you make today changes it. But whether you need an umbrella TODAY depends on the weather — today's clouds, today's wind — which changes hour by hour and is exactly what a forecast tries to track. Static risk factors are a person's geography: fixed, decided long ago, setting a baseline. Dynamic risk factors are their weather: what is happening right now, changing week to week, and the only thing a fresh risk review can usefully update.

Structured walk-through — one person, two axes

Take a concrete case and run both axes through it side by side. A 39-year-old man has antisocial personality disorder (a pattern of disregard for others' rights, diagnosed ten years ago) and two convictions for assault, both from his twenties — his geography: fixed, unchanged, permanent. This month, his weather has turned: he has started drinking a bottle of vodka most nights and was found shouting threats outside his ex-partner's house while intoxicated last night.

If you asked 'what is this man's baseline, long-run risk level', you would look at the geography, the personality disorder diagnosis and the criminal record, and the answer would be 'elevated, and always has been'. But if you asked 'why does he need a more urgent response this week than he did last month', the geography gives you nothing new to say, because none of it changed. Only the weather, the drinking, answers that question, and only the weather is something a care plan (detoxification support, a safety plan, closer monitoring) can actually change before his next review.

Look-alikes & differentials

Looks dynamic but is actually static	How to tell
A diagnosis (e.g. antisocial personality disorder)	The label itself does not come and go with treatment; day-to-day behaviour can fluctuate, but the diagnostic label is coded as a fixed, historical fact on structured tools
A recent conviction or hospital admission	Once it has happened, the event itself is permanently fixed; its recency does not make it changeable
Looks static but is actually dynamic	How to tell
Current mental state, even in a longstanding illness	The illness may be chronic, but an acute exacerbation — new symptoms, new risk — is a state that arose and can resolve
Social circumstances	'Background' sounds fixed, but a recent loss of housing or support is a genuinely reversible, time-limited crisis

Diagnosis — how the classification is actually made

There is no blood test or scan for 'dynamic' versus 'static' — it is established by asking one question about each feature: could treatment, support, or simply time make this different by the next assessment? If the answer is yes, it is dynamic. If the feature already happened, or is simply a fact about who someone is, and nothing can undo that, it is static. Structured professional judgement tools formalise this instead of leaving it to memory: the HCR-20 (Historical, Clinical, Risk management) is the best-known example, scoring a person on a Historical (static) item set alongside separate Clinical and Risk management (dynamic) item sets, so a reassessment can show its working — which items changed, and which never could.

Management — what a team actually does with it

NICE NG10 (Violence and aggression: short-term management in mental health settings) frames risk assessment around exactly this split: it asks teams to identify the current, changeable factors — active substance use, current mental state, the immediate environment — because these are what a ward team can realistically act on to reduce imminent risk, rather than treating a static history as something to manage in the here and now. For self-harm and suicide, NICE NG225 goes further and explicitly recommends against using risk-assessment tools or scales to sort people into low, medium or high risk categories, or to try to predict future self-harm, because they perform poorly at that specific task; instead it recommends a full psychosocial assessment focused on the person's current, changeable needs, which is, in effect, the dynamic layer of this whole framework done properly rather than reduced to a score.

Exam pearl

The vignette will often hand you a dramatic static fact (a violent history, a serious diagnosis) sitting right next to a quiet dynamic one (a missed depot, a few days of heavy drinking) and ask which one actually explains today's change. Before you move on, test yourself: could you explain to a friend why a personality disorder diagnosis from ten years ago counts as static even though the person's behaviour clearly goes up and down week to week?

In one line

Static risk factors are a person's fixed geography and set their baseline; dynamic risk factors are their weather, and only the weather is what a care plan can actually change.