American Outdoor School

You're three days into a backpacking trip in the Wind River Range. Your hiking partner sits down on a rock, grabs their chest, and says something feels wrong. Your nearest hospital is a two-day hike and a three-hour drive away. What questions do you ask?

In the backcountry, there are no lab tests, no imaging machines, no nurses triaging ahead of you. You are the medical provider. The questions you ask — and how you listen to the answers — are your most powerful diagnostic tools. Ask the right ones, and you can build a clear picture of what's happening, make informed treatment decisions, and determine whether someone needs an evacuation. Ask the wrong ones, or none at all, and you're guessing.

That's where OPQRST and SAMPLE come in. These two mnemonics form the backbone of patient assessment in wilderness first aid, and every serious backcountry traveler should have them committed to memory.

Why Patient Questioning Matters More in the Wilderness

In an urban setting, patient questioning is one step in a long chain. The EMT asks some questions, the ER doc runs labs, the specialist orders a scan. Each link adds information. In the wilderness, that chain is just you. Your questions are your lab tests. Your follow-up questions are your imaging. The answers your patient gives you are the only data you have.

This means every question needs to be intentional. You're not asking questions to fill time or because you're unsure what else to do. If you ask a question, you need to listen to the answer, figure out what it means, and use it to inform your next question. Each answer should lead you somewhere — closer to understanding the problem, closer to a treatment decision, closer to knowing whether this person needs to walk out, ride out, or get airlifted.

OPQRST helps you understand the current problem. SAMPLE helps you understand the patient. Together, they give you the full picture.

OPQRST: Understanding What's Happening Right Now

OPQRST is a framework for asking questions about the medical issue your patient is currently experiencing. Not every letter will be relevant to every patient, and sometimes one question will lead to three follow-up questions. That's exactly how it should work. Assessment is about getting to the bottom of the problem — ask as many questions as you need.

O — Onset

Onset has two components: when the problem started, and what the patient was doing when it started. You need both, and you need to put them together.

Consider two patients who both report chest pain that began twenty minutes ago. The first was trail running uphill at 10,000 feet when it started. The second was sitting on a log eating lunch. Same symptom, same timeframe — but the context tells you very different things about what might be happening.

When you ask about onset, get specific. Don't settle for "a while ago." Was it twenty minutes? An hour? Did it come on suddenly or build gradually? And what were they doing at that exact moment — resting, exerting, eating, sleeping?

P — Palliate / Provoke

Palliate means anything that makes the problem better. Provoke means anything that makes it worse. You want to know both.

Say your patient reports difficulty breathing. You ask what makes it worse, and they tell you it gets harder to breathe when they lie down. You ask what makes it better, and they say sitting upright helps. Now you know that lying down provokes the symptom and sitting up palliates it — that's a meaningful clinical finding that points toward specific conditions and away from others.

The same logic applies to any complaint. A patient with a headache might tell you that closing their eyes and blocking out light makes it feel better. A patient with knee pain might say it gets worse going downhill but is fine on flat ground. These details matter when you're deciding on treatment and evacuation plans.

Q — Quality

Quality means asking the patient to describe, in their own words, how the problem feels. Don't put words in their mouth, but you can offer some options if they're struggling. Ask whether the pain is cramping, burning, stabbing, or squeezing — because each of those descriptors can mean different things medically.

Abdominal pain described as "cramping" suggests a different problem than abdominal pain described as "sharp and stabbing." Chest pain that's "squeezing" raises different concerns than chest pain that's "burning." Let the patient tell you what they're experiencing, and pay close attention to the words they choose.

R — Radiate

Radiate refers to whether the problem extends beyond the initially identified area. This is one of the most diagnostically useful questions you can ask.

Here's a classic backcountry example: a patient complains of pain in the upper right quadrant of their abdomen. You ask whether they're experiencing pain anywhere else, and they mention some discomfort in their right shoulder. You ask if they fell or hit their shoulder — they say no. That's radiating pain, and it's a significant finding that changes your assessment entirely.

Radiating pain can also mean the problem has moved. A patient might tell you the pain started in their stomach and has migrated to their lower right abdomen over the past day. That movement pattern is itself a diagnostic clue.

S — Severity

Use a 1-to-10 pain scale, and remember two critical things about it.

First, it's the patient's scale, not yours. If someone has a hangnail and tells you it's a 10 out of 10, then for them it's a 10 out of 10. If someone has a visibly broken bone and says it's a 3, then it's a 3. You're not there to judge their pain tolerance — you're there to establish a baseline.

Second, the real value of the severity scale isn't the initial number. It's how that number changes over time. You assess a patient and they rate their pain at 7. Thirty minutes later, after treatment, you ask again and they say 4. Now you know your treatment is working and the patient is improving. If it went from 7 to 9, you know things are getting worse and you need to adjust your approach. Tracking change over time is the primary purpose of the pain scale.

T — Time

Time asks whether anything has changed between when the problem started and right now. Whether the onset was twenty minutes ago or three days ago, you need to know if the signs and symptoms have evolved.

Here's a question that's particularly useful in the backcountry: if something started two days ago, what changed to make them seek help now? Maybe the pain got worse, maybe a new symptom appeared, maybe they're just scared. Whatever the answer, it tells you something important about the trajectory of the problem.

SAMPLE History: Understanding the Patient

While OPQRST focuses on the current problem, SAMPLE history helps you understand the patient as a whole. Their medical background, medications, and recent intake all provide context that can be critical for treatment decisions — especially when you're hours or days from definitive care.

S — Signs and Symptoms

Signs and symptoms are two different things, and the distinction matters. Signs are objective facts you can observe: the patient is sweaty, pale, has vomited, or has a visible wound. Symptoms are subjective experiences the patient reports: they feel dizzy, weak, or nauseous.

You need both. A patient might tell you they feel fine (no symptoms) while you can see they're pale and sweating (clear signs). Or they might report severe nausea (symptom) with no observable signs yet. Document what you can see and what they tell you — the complete picture is what matters.

A — Allergies

Ask about allergies, and if the patient says no, ask again. Prompt them specifically: "Any allergies to foods or medications?" People forget, especially under stress.

If they do have allergies, you need two pieces of information: what they're allergic to, and how severe the reaction is. An allergy that makes someone mildly uncomfortable is very different from an allergy that causes their throat to swell shut. The severity is the most critical question here — it determines whether you need to be prepared for a life-threatening emergency.

M — Medications

Ask what medications the patient currently takes. If they say none, confirm it: "No prescription medications, nothing over the counter, and no herbal supplements?" People often don't think of daily vitamins or occasional ibuprofen as "medications."

If they are taking something, always ask why. There are thousands of medications and you won't know them all, but knowing that someone takes a medication for a heart condition, for blood pressure, or for diabetes tells you about underlying health issues that directly affect your assessment and treatment. Get the medication name, the dosage, when they last took it, and whether anything has changed recently.

Even if the medication information doesn't help you directly, it could be crucial for the next person who cares for this patient — whether that's a helicopter medic or an ER doctor.

P — Past Pertinent History

This isn't a request for their complete medical biography. You want anything in their history that relates to the current problem. A patient with chest pain — ask about heart disease, prior heart attacks, family history of cardiac problems. A patient with breathing difficulty — ask about asthma, COPD, prior breathing issues.

If a patient has a possible broken bone, previous similar injuries become useful comparison points. You can ask whether the current pain feels similar to or different from the last time they broke something. Their answer helps you assess whether you're dealing with the same type of injury.

L — Last In, Last Out

Last in refers to when, what, and how much the patient last ate and drank. Last out refers to the last time they urinated or defecated. Both give you information about hydration status and digestive function.

Here's an important myth to bust: a common backcountry mistake is jumping to "low blood sugar" when someone hasn't eaten recently. A hiker sits down, says they don't feel well, and someone immediately hands them a granola bar because they last ate at 8 AM and it's now 2 PM. Unless the patient is diabetic, food is almost never the actual medical problem. This kind of tunnel vision can cause you to miss what's really going on. Gather the information, but don't let it lead you to premature conclusions.

E — Events

Events is your quality check. Recap everything you've gathered — from both OPQRST and SAMPLE — back to the patient. Review the story from beginning to end. Make sure you have it right, make sure you haven't missed anything, and give the patient a chance to correct or add information.

This step ties the entire assessment together. OPQRST told you what's happening now. SAMPLE told you about the patient. Events is where you confirm the complete picture before making treatment and evacuation decisions.

Putting It All Together: A Backcountry Scenario

Day two of a five-day backpacking trip. Your tent mate wakes up with severe abdominal pain. Here's how you'd work through both frameworks:

OPQRST: The pain started around 3 AM (onset), and they were lying in their sleeping bag when it woke them up. Nothing makes it better, but moving around makes it worse (palliate/provoke). They describe it as a deep, constant ache — not cramping, not sharp (quality). It started in their mid-abdomen but has moved to the lower right side (radiate). They rate it a 7 out of 10 (severity). It's been getting steadily worse over the past four hours (time).

SAMPLE: They're sweating and pale, and they vomited once an hour ago (signs and symptoms). No known allergies. They take a daily multivitamin, nothing else (medications). No prior abdominal surgeries or GI issues (past pertinent history). They ate a freeze-dried meal around 7 PM last night and drank about a liter of water before bed. They haven't had a bowel movement since yesterday morning (last in, last out). You recap everything back to them and they confirm it's accurate (events).

Now you have a clinical picture built entirely from questions — no equipment required. The migrating pain, the worsening trajectory, and the specific location all inform your next decisions about treatment, monitoring, and whether this person needs to be evacuated.

Learn the Complete Assessment System

OPQRST and SAMPLE are two essential tools, but they're part of a larger wilderness first aid assessment framework that includes primary assessment, vital signs monitoring, physical exams, and treatment protocols. Knowing the right questions to ask is the starting point — knowing what to do with the answers is where real wilderness medicine begins.

Take our free online Wilderness First Aid course to learn the complete patient assessment system, practice with realistic backcountry scenarios, and build the confidence to handle medical emergencies when help is hours away. Optional certification available upon completion.

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This article is part of the American Outdoor School Wilderness First Aid Blog — practical, field-tested wilderness medicine education from certified WFA instructors.