The SAMPLE acronym serves as the foundational framework for gathering a focused medical history in the pre-hospital environment. For Emergency Medical Technicians (EMTs), paramedics, and first responders, these six letters—Signs and Symptoms, Allergies, Medications, Past Medical History, Last Oral Intake, and Events Leading Up—represent a systematic approach to understanding a patient's condition when seconds count and clarity is scarce. In high-pressure emergency scenes, the human brain tends to skip steps; SAMPLE acts as a cognitive safeguard, ensuring that critical data points influencing immediate treatment and hospital handovers are never overlooked.

Defining the Role of SAMPLE in the EMS Assessment Flow

A medical emergency often presents as a chaotic puzzle. The initial arrival on the scene involves a scene size-up and a primary survey to identify immediate life threats (the ABCs: Airway, Breathing, and Circulation). Once the patient is stabilized, the secondary assessment begins, and this is where the SAMPLE history takes center stage.

Unlike the physical examination, which relies on the provider’s senses, the SAMPLE history is a subjective tool. It relies on communication with the patient, family members, or bystanders. The information gathered here often dictates whether a provider suspects a cardiac event, a diabetic emergency, or a simple case of heat exhaustion. Mastering this mnemonic is not just about memorizing the words; it is about understanding the physiological implications behind every answer received.

S: Signs and Symptoms and the Chief Complaint

The first letter, S, requires a distinction between two fundamental types of clinical information. Signs are objective findings—things a responder can see, hear, feel, or smell. A rapid pulse, a rash, or the smell of ketones on a patient's breath are all signs. Symptoms, conversely, are subjective experiences reported by the patient, such as pain, nausea, or dizziness.

In field practice, the goal of this section is to identify the "Chief Complaint." Professional responders often begin with open-ended questions like, "What seems to be the problem today?" rather than leading questions. If a patient mentions chest pain, the S category expands. Experienced EMTs know that the absence of a sign (a "pertinent negative") can be just as important as a positive finding. For instance, if a patient complains of shortness of breath but has clear lung sounds and no wheezing, that lack of a sign steers the diagnostic path away from asthma and perhaps toward a pulmonary embolism or anxiety.

A: Identifying Hidden Allergies to Prevent Anaphylaxis

The A in SAMPLE stands for Allergies. While this seems straightforward, the clinical relevance is profound. Knowing if a patient is allergic to penicillin, sulfa drugs, or latex is vital for the entire continuum of care. In the field, an EMT might not administer many medications, but the information gathered will prevent a nurse or doctor in the Emergency Department from inadvertently causing an anaphylactic reaction.

Beyond medications, environmental and food allergies are critical. A patient found unconscious in a park might have been stung by a bee; knowing they have a severe hymenoptera allergy immediately changes the treatment priority to the administration of epinephrine. When documenting allergies, if the patient reports none, it is documented as NKA (No Known Allergies) or NKDA (No Known Drug Allergies) to prove the question was asked.

M: Medications as a Window Into Medical History

The Medications section is often the most revealing part of the SAMPLE history. The drugs a patient takes—or fails to take—provide a roadmap of their underlying health status. When a patient is confused or unable to articulate their history, their medication list speaks for them. For example, the presence of Metformin indicates diabetes, while Lisinopril suggests hypertension.

Responders should look for three categories of substances:

  1. Prescription Medications: Are they taking them as directed? A patient with a history of seizures who has run out of Keppra is a high-risk transport.
  2. Over-the-Counter (OTC) Drugs: Aspirin, cold medicine, or NSAIDs can significantly impact a patient’s condition, especially in trauma cases where blood thinners are involved.
  3. Herbal Supplements and Vitamins: Many patients do not consider these "medicine," but supplements like St. John’s Wort or Ginseng can have dangerous interactions with emergency drugs.

A professional tip used in the field is the "Brown Bag" technique. If time and scene safety permit, responders should gather all the patient's medication bottles into a bag and transport them to the hospital. This allows the receiving physician to see exact dosages and refill dates, which can hint at non-compliance or accidental overdose.

P: Past Medical History and Chronic Conditions

The P stands for Past Medical History. This section focuses on pre-existing conditions that might complicate the current emergency. The focus should be on "pertinent" history. While a broken leg twenty years ago might not matter for a current respiratory distress call, a history of COPD, Congestive Heart Failure (CHF), or previous Myocardial Infractions (MI) is essential.

Effective EMTs ask specifically about surgeries and hospitalizations within the last few months. A patient complaining of leg pain who recently had hip surgery is at a much higher risk for a Deep Vein Thrombosis (DVT). Furthermore, asking about a family history of sudden cardiac death can provide clues in pediatric or young adult syncope cases.

L: Last Oral Intake and the Risk of Aspiration

Last Oral Intake (L) is frequently underestimated by students but is a high priority for surgical teams. Knowing when a patient last ate or drank—and specifically what they consumed—is vital if the patient requires intubation or emergency surgery. A full stomach significantly increases the risk of aspiration, where stomach contents enter the lungs, leading to fatal pneumonia.

In diabetic emergencies, the "Last Oral Intake" is the most important factor in determining the cause of hypoglycemia or hyperglycemia. If a patient took their insulin but skipped breakfast, the physiological cause of their altered mental status becomes clear. Responders should also inquire about alcohol or recreational drug consumption under this category, as these substances affect both the clinical presentation and the safety of future sedation.

E: Events Leading Up to the Injury or Illness

The final letter, E, focuses on the timeline. This is not about the medical history, but the immediate circumstances surrounding the emergency. "What were you doing when this started?" is the quintessential question.

For trauma patients, this helps establish the Mechanism of Injury (MOI). Did the patient fall because they tripped, or did they feel dizzy first and then collapse? The former is a trauma call; the latter is a medical call that resulted in trauma. For medical patients, the E helps establish the onset. A sudden onset of a headache (the "thunderclap" headache) suggests a subarachnoid hemorrhage, whereas a gradual onset might suggest a different pathology.

Integrating SAMPLE with the OPQRST Pain Assessment

While SAMPLE provides the broad medical history, it is often used in tandem with OPQRST to drill down into a specific symptom, usually pain or shortness of breath. The two mnemonics complement each other to create a high-definition picture of the patient’s status.

  • Onset (O): Correlates with the Events in SAMPLE.
  • Provocation (P): Does moving make it worse? (Often linked to Signs).
  • Quality (Q): Is it sharp, dull, or crushing?
  • Radiation (R): Does the pain move to the jaw or back?
  • Severity (S): On a scale of 1–10.
  • Time (T): How long has this been happening?

When a responder combines these two, the hand-off report to the hospital becomes professional and concise: "We have a 65-year-old male complaining of crushing chest pain (S) that started 20 minutes ago while mowing the lawn (E). He has a history of hypertension (P) and takes Lisinopril (M). He has no known allergies (A) and last ate lunch two hours ago (L). The pain is a 9/10 and radiates to the left arm."

Adapting SAMPLE for Non-Verbal and Pediatric Patients

The greatest challenge in using the SAMPLE acronym occurs when the patient cannot speak. This includes patients with a high level of consciousness impairment, infants, or those with severe dementia. In these scenarios, the EMT must become a clinical detective.

For pediatric patients, the parents are the primary source of the SAMPLE history. It is important to ask about recent immunizations or changes in diaper output (which falls under Last Oral Intake/Output). For elderly patients in nursing homes, the "Medications" and "Past Medical History" are often found on a printed face sheet. Responders must be adept at scanning these documents quickly to find the "pertinent" information amidst pages of data.

In cases of trauma where the patient is unconscious and no bystanders are present, the EMT relies heavily on physical "Signs" and "Events" (inferred from the scene, such as the damage to a vehicle). A medical alert bracelet can often provide the "Allergies" and "Past Medical History" that the patient cannot.

The Importance of Precise Documentation in the PCR

In the eyes of the law and the medical community, "if it wasn't documented, it wasn't done." The SAMPLE history forms the backbone of the "Narrative" section of the Patient Care Report (PCR). Professional documentation uses the SAMPLE structure to organize thoughts, making the report easier for follow-up care providers to read.

When documenting the history, using professional terminology is key. Instead of writing "Patient says they have a bad heart," a responder writes "Patient reports a history of congestive heart failure." Instead of "Patient took a hit of something," a responder writes "Patient admits to the ingestion of an unknown substance." This level of detail ensures that the SAMPLE history collected in the field remains a reliable source of truth as the patient moves through the healthcare system.

Common Pitfalls for Trainees Using SAMPLE

Trainees often treat SAMPLE as a checklist to be "gotten through" rather than a conversation to be had. One common mistake is "tunnel vision," where a responder hears one symptom and stops asking the rest of the questions. For example, if a patient says they have a headache, the responder might skip "Last Oral Intake," missing the fact that the patient hasn't eaten in 24 hours and is actually hypoglycemic.

Another pitfall is failing to verify the information. Patients may forget medications or downplay their medical history out of fear or embarrassment. Cross-referencing the patient’s verbal history with the medications found on the nightstand is a hallmark of an experienced and thorough EMT.

Clinical Relevance: Why the ED Needs This Information

The transition from the ambulance to the Emergency Department (ED) is a high-risk moment for patient safety. The SAMPLE history is the most important "data package" passed during this transition.

  • Allergies: Prevents medication errors in the trauma bay.
  • Medications: Alerts the doctor to potential drug interactions with sedation or paralytics.
  • Past History: Helps the doctor differentiate between a new acute problem and a chronic one.
  • Last Oral Intake: Directly influences the decision to proceed with emergency surgery or wait.

By providing a concise SAMPLE history, the EMT enables the hospital team to pick up exactly where the pre-hospital care left off, saving time and potentially saving a life.

Summary of the SAMPLE Mnemonic

The SAMPLE acronym is an indispensable tool that transforms a chaotic collection of facts into a structured medical history. By systematically covering Signs and Symptoms, Allergies, Medications, Past Medical History, Last Oral Intake, and Events, EMTs ensure they have the necessary information to treat the patient effectively and communicate clearly with the rest of the medical team. Whether used for a simple fall or a complex multi-system trauma, SAMPLE remains the gold standard for patient history in the field of Emergency Medical Services.

Frequently Asked Questions

What is the difference between a Sign and a Symptom in SAMPLE?

A sign is an objective finding that the EMT can observe, such as bruising, bleeding, or a high blood pressure reading. A symptom is a subjective feeling reported by the patient, such as "my chest feels tight" or "I feel nauseous."

When should I use SAMPLE vs. OPQRST?

SAMPLE is used to gather the patient’s overall medical history. OPQRST is used specifically to evaluate a patient's pain or chief complaint. Usually, they are used together during the secondary assessment.

Why is "Last Oral Intake" important for non-diabetic patients?

For any patient who might need surgery, the time of their last meal is critical. If they have a full stomach, there is a high risk of vomiting and inhaling that vomit (aspiration) while under anesthesia, which can cause severe lung damage or death.

How do I get a SAMPLE history from an unconscious patient?

Look for medical alert jewelry (bracelets or necklaces), check the patient's phone for "Emergency SOS" info, look for medications in the immediate area, and interview bystanders or family members who may have witnessed the event.

Does the "E" in SAMPLE only apply to accidents?

No. In medical cases, "Events Leading Up" refers to what the patient was doing when the illness began. For example, did the shortness of breath start while they were resting or while they were climbing stairs? This distinction helps determine the severity of the condition.