Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Involuntary Evaluation Capacity and Medical Clearance

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In one line

·Capacity means you can understand the facts, see how they apply to you, reason through your options, and tell someone your choice.

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Normal physiology

·Your brain uses chemical messengers—dopamine (pushes action and reward), serotonin (smooths mood and sleep), norepinephrine (wakes you up and focuses you), GABA (the main brake that calms everything down), and glutamate (the main gas pedal that fires neurons)—to keep your thinking, feeling, and choosing in a safe, flexible range.

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What goes wrong

·Chronic stress, trauma, severe mental illness (like schizophrenia or bipolar disorder), substance use, or a medical emergency (brain bleed, infection, dangerously low blood sugar, thyroid storm) can flood or starve the brain's chemical messengers and damage the prefrontal cortex (the part that plans and brakes) and the hippocampus (the part that files memories and context). When that happens, the amygdala (alarm center) stays on high alert with no one to calm it down, so every moment feels dangerous even when it is not, and the person cannot think through choices clearly or see how the facts apply to their own safety.

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Hallmark signs

·Patient cannot explain what the proposed treatment is or what it would involve
·Patient cannot say what might happen if they accept or refuse the treatment
·Patient cannot weigh the risks and benefits to make a choice
·Patient's reasoning is driven entirely by a delusion or false belief
·Patient cannot communicate a stable choice over time
·Patient is cooperative but answers are vague, off-topic, or nonsensical
·Patient seems alert but cannot hold new information for more than a few seconds
·Patient refuses to engage in the capacity interview at all

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Red flags · escalate now

·Active hallucinations or delusions that control the patient's reasoning about treatment
·Fluctuating level of consciousness or attention span under two minutes
·Recent head injury, stroke, overdose, or metabolic crisis (hypoglycemia, severe sepsis, liver failure) that was not medically cleared
·Patient is a danger to self or others and emergency psychiatric hold is indicated under state involuntary-commitment law

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Workup

·Fingerstick glucose
·Complete blood count (CBC)
·Basic metabolic panel (BMP, also called Chem-7)
·Thyroid-stimulating hormone (TSH)
·Urine drug screen (UDS)
·Electrocardiogram (ECG)
·Urinalysis (UA) and urine culture if indicated
·CT head (non-contrast) if new confusion, focal weakness, severe headache, or fall

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Treatment

·Assess the four capacity components for THIS specific decision: understanding the situation, appreciating it applies to them, reasoning through choices, and stating a clear choice
·Medical clearance: rule out delirium, intoxication, low blood sugar (hypoglycemia), infection, stroke, thyroid storm, or medication side effects mimicking psychiatric crisis
·Involuntary psychiatric hold (criteria: imminent danger to self, imminent danger to others, or grave disability preventing basic self-care) with interpreter services if needed—never use family as interpreter for safety or consent questions
·Medication targeting the specific brain circuit: antipsychotic (blocks dopamine) for psychosis, antidepressant (boosts serotonin) for severe depression, benzodiazepine (boosts GABA, the brain's calming signal) for acute agitation or panic
·Before discharge: coordinate housing, substance-use treatment if needed (medication-assisted treatment for opioid or alcohol use disorder), outpatient psychiatry appointment within 7 days, and a written safety plan with crisis phone numbers
·Reassess capacity after 24 to 72 hours of treatment, safety, and sleep. Capacity is task-specific and can return even if the underlying illness remains

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NCLEX trap

·Understanding the words (the first piece of capacity) is NOT the same as believing those words describe what is actually happening to them right now (the second piece, called appreciation). Psychosis breaks appreciation — the person hears you but does not believe it applies to their own situation. If appreciation is broken, capacity is broken, even if understanding is perfect.
·Saying no to help does NOT prove lack of capacity. A person with full capacity has the legal right to refuse — even if you think the refusal is unwise. You must test all four pieces of capacity (understanding, appreciation, reasoning, and expressing a choice). Only if those pieces are broken AND the person meets danger criteria (danger to self, danger to others, or gravely disabled) can you proceed with an involuntary hold.
·Medical clearance comes FIRST, always. You must rule out stroke, thyroid storm (sudden overactive thyroid that can cause confusion and agitation), low blood sugar, infection, and serotonin syndrome (a dangerous reaction when certain brain chemicals build up too high) before giving any psychiatric medication. A medical emergency can look exactly like psychosis, and giving a psychiatric drug to a stroke patient can hide the real problem and cause harm.
·Capacity is ALWAYS decision-specific. A patient may lack capacity to refuse a psychiatric hold (because psychosis broke their appreciation and reasoning for that choice) but still have full capacity to choose which medication they want, or whether to call their family. You must reassess capacity separately for EACH decision.
·Agitation and anger alone do NOT meet the legal criteria for danger to others. You need evidence of intent (they plan to hurt someone), history (they have hurt people before), or an imminent threat (they are about to hurt someone right now). Write down exactly what the patient said or did. Anger by itself is not danger.
·Capacity can be reassessed at ANY time after treatment starts. If medical treatment or medication fixes the brain problem (for example, antipsychotics quiet the voices and delusions, or thyroid medication corrects thyroid storm), capacity may return within hours or days. Document the reassessment and explain why capacity was restored. The 72-hour mark is the legal limit for the hold in many states, not a minimum waiting period for reassessment.

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