SAMPLE History: A Practical Guide for EMS Assessment
SAMPLE is a structured memory aid used in emergency assessment: Signs and symptoms, Allergies, Medications, Past medical history, Last oral intake and Events leading up to the illness or injury. Its purpose is not to “complete an acronym”; it is to obtain the information that changes risk assessment, treatment and handover.
S — Signs and symptoms
Start with what the patient feels and what you observe. Clarify onset, progression, severity and associated symptoms. If pain is central, OPQRST can add useful detail.
A — Allergies
Ask about medication allergies, food allergies and severe reactions. Clarify what actually happened during previous reactions when possible.
M — Medications
Medication lists can reveal hidden diagnoses, bleeding risk, immunosuppression and treatments that may alter vital signs. Ask about prescription drugs, over-the-counter products and relevant recreational substances.
P — Past medical history
Focus on conditions that change the current risk: cardiovascular disease, respiratory disease, diabetes, seizures, pregnancy, recent surgery, clotting history and other relevant chronic illness.
L — Last oral intake
Last food and drink may matter for procedures, aspiration risk, diabetes and the timing of symptoms. In some cases, asking about last medications is equally important.
E — Events leading up
What happened immediately before the problem? Mechanism, exertion, trauma, illness, medication change, exposure or sudden neurological symptoms may all change the differential.
Common mistake: asking without interpreting
A strong EMS history links answers to risk. “Takes apixaban” matters differently after minor trauma than “takes vitamin D.” “Last ate eight hours ago” matters differently in hypoglycemia than in isolated ankle pain.
How SAMPLE fits with ABCDE
Life threats come first. SAMPLE is usually gathered once immediate ABCDE problems are identified and managed, then revisited as the situation evolves.
How to ask SAMPLE efficiently
Do not ask the acronym as six disconnected questions. Use it to build a timeline and identify risk. Start with the chief problem, then focus on answers that may change treatment, destination or handover.
Useful follow-up questions
- Signs/Symptoms: onset, progression, severity and associated symptoms.
- Allergies: what reaction occurred and how severe it was.
- Medications: recent changes, missed doses and high-risk drugs such as anticoagulants.
- Past history: conditions relevant to the current complaint.
- Last intake: food, fluids and sometimes last medication.
- Events: what happened immediately before the problem began.
When SAMPLE should not delay care
In an unstable patient, immediate ABCDE priorities come first. History can be obtained from family, bystanders, medication lists or previous records while life threats are being managed.
Using SAMPLE in handover
SAMPLE becomes most useful when combined with a concise clinical story: what happened, what you found, what changed, what you did and how the patient responded.
Why a good SAMPLE history changes care
SAMPLE is most useful when each answer changes what you think, what you look for next or what you communicate. The acronym prevents important domains from being forgotten, but value comes from interpretation. A medication list can reveal anticoagulation, immunosuppression or a hidden cardiac diagnosis. A recent surgery can change the significance of chest pain or dyspnea. A food allergy matters differently from anaphylaxis to a medication.
The best SAMPLE history is selective, clinically relevant and integrated with the patient’s current problem.
S — Signs and symptoms: separate what the patient feels from what you observe
Symptoms are subjective experiences such as pain, dizziness or nausea. Signs are objective findings such as weakness, rash, altered speech or labored breathing. Combining both gives a more complete picture.
Clarify onset, progression, associated symptoms and what has changed from baseline. If the patient has several complaints, identify the main reason for concern rather than collecting disconnected details.
A — Allergies: reaction matters more than the label
Ask what happened during the reported allergy. “Penicillin allergy” may mean a mild rash, anaphylaxis or simply nausea. That distinction can matter for hospital care and medication decisions.
Also ask about food, insect and latex allergies when relevant. In a suspected allergic emergency, establish the trigger, timing, previous reactions and whether an auto-injector was used.
M — Medications: a hidden diagnostic map
Medication lists often reveal more than patients remember about their diagnoses. Anticoagulants raise concern after trauma or bleeding. Beta-blockers can blunt tachycardia. Insulin suggests diabetes. Immunosuppressants increase infection risk. Diuretics may contribute to dehydration.
Ask about recent changes, missed doses and adherence when relevant. Over-the-counter medication, supplements and recreational substances can also matter.
P — Past medical history: prioritize relevance
You do not need every childhood diagnosis. Focus on conditions that change current risk: cardiac disease, respiratory disease, diabetes, epilepsy, kidney disease, cancer, clotting history, recent surgery, pregnancy and previous similar episodes.
Previous hospital admissions or procedures can provide important context. A patient with prior pulmonary embolism and new unexplained dyspnea deserves a different level of suspicion than a patient without that history.
L — Last oral intake: more than aspiration risk
Food and fluid timing can matter in hypoglycemia, dehydration, abdominal illness and possible procedures. Ask what was consumed as well as when. In some cases, last medication, last dialysis or last normal meal may be more clinically relevant than the traditional “last oral intake” question.
E — Events leading up: reconstruct the chain
This is often the most valuable part of SAMPLE. What was the patient doing immediately before symptoms began? Was there exertion, trauma, a meal, medication, allergen exposure, prolonged immobility or emotional stress? Did the patient fall because they tripped, or did they collapse first and then fall?
Events help distinguish cause from consequence and reduce anchoring on the most obvious finding.
Use witnesses and records when the patient cannot answer
Family, caregivers, medication lists, discharge letters and electronic records can provide critical history in patients with dementia, language barriers, severe illness or reduced consciousness. Ask who last saw the patient well and what is different from baseline.
Document where important information came from if the patient could not confirm it themselves.
How SAMPLE changes in trauma
In trauma, mechanism and anticoagulant use may be especially important. Ask about medical conditions that increase risk, medications that affect bleeding and events before the injury. Did the patient fall because of syncope? Was there chest pain before the collision?
Do not let the visible injury prevent investigation of a medical event that may have caused the trauma.
How SAMPLE changes in neurological emergencies
For stroke or altered consciousness, establish baseline neurological function, medications, anticoagulation, seizure history and last known well. Events and timing become more important than completing every element of the acronym.
How SAMPLE changes in respiratory emergencies
Ask about asthma or COPD, previous ICU admissions, home oxygen, inhaler use, smoking, recent infection, chest pain and previous pulmonary embolism when relevant. Medication response can help describe severity, but should not be used alone to establish a diagnosis.
How SAMPLE changes in pregnancy
Pregnancy status, gestational age, prior obstetric history, bleeding, pain, fetal movement and pregnancy-related complications may need to be added. Standard SAMPLE does not contain every important obstetric question, so adapt the framework.
Medication reconciliation in the field
When possible, look at actual medication packaging rather than relying only on memory. Record dose and timing if relevant. High-risk medications such as anticoagulants, insulin, opioids and antiarrhythmics can materially alter assessment.
Do not spend excessive time transcribing a long medication list in an unstable patient. Photographing or bringing the list according to local policy may be more efficient.
Avoid turning SAMPLE into an interrogation
Use natural conversation. Patients may be anxious, breathless or in pain. Ask the most important questions first and return to lower-priority details later. Closed yes/no questions are useful for clarification, but open questions often reveal information you did not anticipate.
Field scenario: minor fall on anticoagulants
An older patient has a small scalp bruise after a low-level fall and feels well. SAMPLE reveals apixaban use and that the patient briefly lost consciousness before falling. Those two details significantly change the risk assessment and destination considerations.
Field scenario: “simple” gastroenteritis
A patient with vomiting and weakness reports diabetes, poor oral intake, missed insulin and increasing drowsiness. SAMPLE reveals that the complaint may involve a metabolic emergency rather than uncomplicated gastrointestinal illness.
Common mistakes
- asking every letter mechanically regardless of relevance
- recording medications without considering what they imply
- failing to clarify what an “allergy” reaction actually was
- ignoring baseline function in frail or cognitively impaired patients
- missing the event that caused the injury
- letting history collection delay treatment of an unstable patient
Key points
- Prioritize information that affects care, destination or handover.
- Clarify allergy reactions and high-risk medications.
- Use events to reconstruct what actually happened.
- Adapt the framework to trauma, neurological, respiratory and obstetric cases.
- Use witnesses and records when the patient cannot provide history.
FAQ
Is SAMPLE only for medical cases? No. It is also useful in trauma and many other EMS presentations.
Do you need every answer? No. Relevant information matters more than completing every letter mechanically.