Assessing a patient with a medical complaint follows a systematic process: ensure the scene is safe, check for life-threatening problems first, gather a focused history, perform a physical exam, and then synthesize everything into a working diagnosis. Each step builds on the last, and skipping ahead can mean missing critical information. Whether you’re a nursing student, EMT trainee, or allied health professional, understanding this sequence is essential to delivering safe, effective care.
Start With the ABCDE Primary Survey
Before anything else, the priority is identifying conditions that could kill the patient in minutes. The ABCDE framework provides a structured way to do this, working through each letter in order:
- Airway: Is the patient able to speak? Is there any obstruction, swelling, or abnormal sounds like stridor? If the airway is compromised, nothing else matters until it’s secured.
- Breathing: Look at the chest for symmetrical rise and fall, count the respiratory rate (normal is 12 to 18 breaths per minute in adults), and listen for abnormal breath sounds. Check oxygen saturation if a pulse oximeter is available.
- Circulation: Assess heart rate (normal resting range: 60 to 100 beats per minute), blood pressure (normal: between 90/60 and 120/80 mmHg), and skin color and temperature. Look for signs of bleeding or shock, such as pale, cool, clammy skin.
- Disability: Check the patient’s level of consciousness, pupil size and reactivity, and blood glucose. A decreased level of consciousness caused by low blood sugar can be corrected quickly, so this is always worth checking early.
- Exposure: Remove clothing as needed to look for clues: signs of trauma, bleeding, rashes, needle marks, or other findings that could explain the complaint. Monitor body temperature throughout.
This entire survey can take under two minutes in an experienced clinician’s hands. The point is to catch and address the most dangerous problems first, then move into a more detailed evaluation once the patient is stable.
Gathering a Focused Patient History
Once immediate threats are ruled out, the next step is understanding what brought the patient in. The history is often the single most valuable piece of the assessment. Two mnemonics help ensure nothing important gets missed: OPQRST for the complaint itself and SAMPLE for the broader medical picture.
OPQRST: Characterizing the Complaint
OPQRST works especially well for pain-related complaints, but you can adapt it to almost any symptom:
- Onset: When did it start? Was it sudden or gradual?
- Provocation/Palliation: What makes it worse? What makes it better?
- Quality: How would you describe it? Sharp, dull, crushing, burning, throbbing?
- Region/Radiation: Where exactly is it? Does it move or spread to another area?
- Severity: On a scale of 0 to 10, how bad is it? Zero means no pain, ten means the worst imaginable.
- Time: How long has it lasted? Is it constant or does it come and go? Has it changed since it started?
These questions accomplish two things at once. They give you detailed information about the symptom, and they help the patient feel heard because you’re asking about their specific experience rather than jumping to conclusions.
SAMPLE: The Broader Medical Picture
SAMPLE fills in the background that could change your entire approach to the patient:
- Signs and Symptoms: What you observe (signs) and what the patient reports (symptoms), including the chief complaint.
- Allergies: Particularly medication allergies, since these can have life-threatening consequences and directly affect treatment options.
- Medications: Everything the patient takes, including over-the-counter drugs and supplements. This matters for identifying drug interactions and can also explain certain symptoms as side effects.
- Past medical history: Previous diagnoses, surgeries, and hospitalizations. Ask whether the patient has ever experienced the current symptoms before.
- Last oral intake: When and what the patient last ate or drank. This is relevant for conditions affecting appetite, blood sugar, and for any procedures that might require sedation.
- Events leading up: What was the patient doing when the complaint began? This is especially important in trauma, but it also helps contextualize medical complaints. A patient with chest pain who was exercising tells a different story than one who was resting.
Performing the Physical Exam
The physical examination follows a standard four-step sequence: inspection, palpation, percussion, and auscultation. You look first, then touch, then tap, and finally listen. This order matters because touching or pressing on the body can change what you find later. For example, palpating the abdomen before listening with a stethoscope can alter bowel sounds and give you misleading information.
Inspection starts the moment you see the patient. Their posture, facial expression, skin color, breathing pattern, and general appearance all provide information before you ever lay hands on them. Palpation means using your hands to feel for tenderness, swelling, masses, or abnormal texture. Percussion involves tapping on body surfaces to assess what’s underneath, particularly useful in the chest and abdomen to distinguish between fluid, air, and solid tissue. Auscultation means listening with a stethoscope to the heart, lungs, and bowel sounds.
In practice, you focus the exam on the areas most relevant to the complaint. A patient with isolated ankle pain after a fall doesn’t need a full cardiovascular workup. But a patient with vague symptoms like fatigue and weight loss may need a much broader examination.
Building a Differential Diagnosis
With the history and physical complete, the next task is generating a list of possible conditions that could explain the findings. This is called a differential diagnosis. The process works like detective work: gather clues, assemble a list of suspects, then use additional testing to narrow it down.
The differential diagnosis list is based on the patient’s specific symptoms, medical history, family health history, medications, and lifestyle. Each possible condition on the list is then evaluated. Some can be ruled out based on the physical exam alone. Others require lab work, imaging, or specialized tests. If the list includes a serious condition that might need urgent treatment, testing for that condition takes priority.
Clinical reasoning here isn’t purely mechanical. Pattern recognition plays a large role, especially with experience. A crushing chest pain radiating to the left arm in a 60-year-old with diabetes and high blood pressure triggers a very different response than the same complaint in a 22-year-old who just finished a large meal. The same symptom can point to dozens of conditions, and the patient’s full context is what helps you sort through them.
Recognizing Red Flag Symptoms
Certain findings during an assessment should immediately raise your concern, regardless of the presenting complaint. These red flags signal conditions that can deteriorate quickly or indicate serious underlying disease.
Some red flags are general: unexplained weight loss and loss of appetite can point to many serious pathologies, from cancer to chronic infection. Others are highly specific. Vomiting material that looks like coffee grounds in a patient who regularly takes anti-inflammatory medications is a strong indicator of upper gastrointestinal bleeding from a peptic ulcer. Constipation combined with painless rectal bleeding raises concern for colon cancer, even though constipation alone is not a red flag.
For headaches, the key red flags include a thunderclap headache (reaching maximum intensity within seconds), headache with fever and neck stiffness, headache with changes in vision or weakness on one side, and headache with swelling at the back of the eye. Each of these combinations points to potentially life-threatening conditions like brain hemorrhage or meningitis.
Communication That Improves Your Assessment
The quality of information you gather depends directly on how you communicate. Open-ended questions produce far richer answers than yes-or-no questions. Instead of asking “Does your chest hurt?” try “Tell me more about what you’re feeling.” Instead of “Are you stressed?” ask “What’s been going on in your life recently?” These questions give patients room to share details they might not have thought to mention otherwise.
Nonverbal communication matters just as much. Face the patient directly, maintain an open posture (avoid crossing your arms), lean slightly forward to show interest, make appropriate eye contact, and stay relaxed. These behaviors signal that you’re genuinely listening, which makes patients more likely to share complete and accurate information.
Reflective listening, where you rephrase what the patient has said and verify your understanding, serves a dual purpose. It confirms that you heard them correctly and it shows the patient they’re being taken seriously. A patient who feels dismissed is less likely to mention the one detail that changes the whole picture.
Adjustments for Older Adults
Assessing elderly patients often requires modifications to the standard approach. Fatigue from medical illness, reduced health literacy, and cognitive impairments can all affect how well an older patient engages with a lengthy assessment. Research on geriatric assessments found that 30% of older adults lost focus during extended evaluations due to the sheer number and length of questions involved.
Some standard assessment tools may not work as expected. Tests that require physical mobility won’t apply to patients who can’t walk on admission. Screening questionnaires for depression can make some older patients uncomfortable, particularly when questions feel intrusive or unfamiliar. Mental status assessments that involve multi-step commands may not be suitable for patients with even moderate cognitive impairment.
The practical adjustment is to prioritize the most clinically relevant questions, keep the assessment as concise as possible, and break longer evaluations into shorter sessions when fatigue is an issue. Speaking clearly, allowing extra time for responses, and confirming understanding throughout the conversation all help ensure you get accurate information without overwhelming the patient.
Documenting What You Find
The standard format for documenting a patient assessment is the SOAP note, which organizes findings into four sections that mirror the assessment process itself.
The Subjective section captures what the patient tells you: their chief complaint, the history of the present illness, relevant medical history, medications, allergies, and any pertinent details from their own perspective. This is the patient’s story in their own words. The Objective section records what you measured and observed: vital signs, physical exam findings organized by body system, and any test results. Organizing objective findings by system (neurological, cardiovascular, respiratory) makes the note easier to review later.
The Assessment section is where clinical reasoning lives. Here you synthesize the subjective and objective data into a working diagnosis and list your differential diagnoses, explaining which findings support or argue against each possibility. The Plan section outlines what happens next: further testing, treatments, follow-up timing, and patient education. Together, these four sections create a complete record that any other clinician can pick up and immediately understand where things stand.