INTERPRETING FINDINGS AND
FORMULATING DIFFERENTIAL DIAGNOSES
ADVANCED ASSESSMENT 2026
Section 1: Core Principles of Advanced Assessment (Q1-Q25)
Q1: What is the primary purpose of advanced health assessment?
A: To collect subjective and objective data to formulate a prioritized differential
diagnosis, not just to identify a single disease.
Q2: Define "subjective data."
A: Information provided by the patient (or family) about their history,
symptoms, and perceptions (e.g., the History of Present Illness, Review of
Systems).
Q3: Define "objective data."
A: Observable, measurable data obtained by the clinician through physical
examination, laboratory tests, and diagnostic imaging.
Q4: What is a differential diagnosis?
A: A list of potential diagnoses that could explain a patient's presenting signs
and symptoms, ranked by likelihood and severity.
Q5: What is the "most likely" diagnosis versus the "most dangerous"
diagnosis?
A: The most likely is the most common cause for the presentation; the most
dangerous is the one that, if missed, would cause the most harm. You must rule
out the dangerous ones first.
Q6: Explain the concept of "diagnostic reasoning."
A: The cognitive process of gathering data, identifying patterns, generating
hypotheses (differential diagnoses), and testing those hypotheses to arrive at a
final diagnosis.
Q7: What is the role of "illness scripts" in diagnostic reasoning?
A: They are mental templates of how a disease typically presents, developed
through experience. They help clinicians quickly recognize patterns and trigger
appropriate differentials.
,Q8: Differentiate between a sign and a symptom.
A: A symptom is what the patient reports (subjective, e.g., pain); a sign is what
the clinician observes (objective, e.g., tenderness).
Q9: What is the "Review of Systems" (ROS)?
A: A systematic review of body systems to uncover symptoms the patient may
not have volunteered, helping to broaden or narrow the differential.
Q10: What is the "History of Present Illness" (HPI) and what are its key
components?
A: A detailed, chronological account of the patient's chief complaint. Key
components include: Onset, Location, Duration, Character,
Aggravating/Alleviating factors, Radiation, Timing, and Severity
(OLDCARTS).
Q11: How does the patient's age influence your differential diagnosis?
A: It is a primary filter. For example, chest pain in a 20-year-old has a very
different differential (e.g., musculoskeletal, anxiety) than in a 60-year-old (e.g.,
myocardial infarction, angina).
Q12: What are "red flags" in a patient history?
A: Specific symptoms or signs that suggest a serious, potentially life-
threatening condition (e.g., unintentional weight loss, night sweats, severe pain,
neurological deficits).
Q13: What is the difference between a "probable" and a "possible"
diagnosis?
A: A probable diagnosis is supported by strong evidence and is the most likely
explanation. A possible diagnosis is on the differential but has less supporting
evidence or is less common.
Q14: Define "prevalence" and "incidence."
A: Prevalence is the total number of cases in a population at a given time.
Incidence is the number of new cases over a specific period.
Q15: How do prevalence and incidence affect your differential diagnosis?
A: Common things are common. A diagnosis with a high prevalence is more
likely to be the cause of a patient's symptoms than a rare one, all else being
equal.
Q16: What is the "test of treatment"?
A: A diagnostic strategy where a patient is treated for the most likely diagnosis
and their response to treatment helps confirm or refute that diagnosis.
, Q17: What is "anchoring bias" in diagnostic reasoning?
A: The tendency to lock onto the first piece of information (the "anchor") and
fail to adjust the differential as new data emerges.
Q18: What is "confirmation bias"?
A: The tendency to seek out and interpret new evidence as confirmation of one's
existing beliefs or hypotheses, while ignoring contradictory evidence.
Q19: What is the "hypothetico-deductive model" of diagnosis?
A: A model where the clinician generates early hypotheses based on initial data,
then deductively seeks specific information (history, exam, tests) to confirm or
eliminate those hypotheses.
Q20: Why is it crucial to consider a "worst-case scenario" differential?
A: To ensure that life-threatening or emergent conditions (e.g., aortic dissection,
meningitis, ectopic pregnancy) are ruled out before focusing on more benign
explanations.
Q21: What is a "syndrome"?
A: A collection of signs and symptoms that occur together and characterize a
particular abnormality or condition, but whose underlying cause may not be
fully understood (e.g., metabolic syndrome).
Q22: How do you prioritize your differential diagnosis?
A: 1. Most Dangerous (must rule out), 2. Most Likely (most common), 3. Most
Treatable.
Q23: What is "diagnostic momentum"?
A: The tendency for a diagnosis made by a previous clinician to be uncritically
accepted and perpetuated, preventing reconsideration of the diagnosis.
Q24: Define "sensitivity" and "specificity" of a diagnostic test.
A: Sensitivity is the ability of a test to correctly identify those with the disease
(true positive rate). Specificity is the ability to correctly identify those without
the disease (true negative rate).
Q25: How do you use a test with high sensitivity?
A: A highly sensitive test is best for ruling out a disease. If the test is negative,
you can be confident the patient does not have the disease (SnNout: Sensitive
test, Negative result, rules out).
Section 2: The General Survey & Vital Signs (Q26-Q35)
FORMULATING DIFFERENTIAL DIAGNOSES
ADVANCED ASSESSMENT 2026
Section 1: Core Principles of Advanced Assessment (Q1-Q25)
Q1: What is the primary purpose of advanced health assessment?
A: To collect subjective and objective data to formulate a prioritized differential
diagnosis, not just to identify a single disease.
Q2: Define "subjective data."
A: Information provided by the patient (or family) about their history,
symptoms, and perceptions (e.g., the History of Present Illness, Review of
Systems).
Q3: Define "objective data."
A: Observable, measurable data obtained by the clinician through physical
examination, laboratory tests, and diagnostic imaging.
Q4: What is a differential diagnosis?
A: A list of potential diagnoses that could explain a patient's presenting signs
and symptoms, ranked by likelihood and severity.
Q5: What is the "most likely" diagnosis versus the "most dangerous"
diagnosis?
A: The most likely is the most common cause for the presentation; the most
dangerous is the one that, if missed, would cause the most harm. You must rule
out the dangerous ones first.
Q6: Explain the concept of "diagnostic reasoning."
A: The cognitive process of gathering data, identifying patterns, generating
hypotheses (differential diagnoses), and testing those hypotheses to arrive at a
final diagnosis.
Q7: What is the role of "illness scripts" in diagnostic reasoning?
A: They are mental templates of how a disease typically presents, developed
through experience. They help clinicians quickly recognize patterns and trigger
appropriate differentials.
,Q8: Differentiate between a sign and a symptom.
A: A symptom is what the patient reports (subjective, e.g., pain); a sign is what
the clinician observes (objective, e.g., tenderness).
Q9: What is the "Review of Systems" (ROS)?
A: A systematic review of body systems to uncover symptoms the patient may
not have volunteered, helping to broaden or narrow the differential.
Q10: What is the "History of Present Illness" (HPI) and what are its key
components?
A: A detailed, chronological account of the patient's chief complaint. Key
components include: Onset, Location, Duration, Character,
Aggravating/Alleviating factors, Radiation, Timing, and Severity
(OLDCARTS).
Q11: How does the patient's age influence your differential diagnosis?
A: It is a primary filter. For example, chest pain in a 20-year-old has a very
different differential (e.g., musculoskeletal, anxiety) than in a 60-year-old (e.g.,
myocardial infarction, angina).
Q12: What are "red flags" in a patient history?
A: Specific symptoms or signs that suggest a serious, potentially life-
threatening condition (e.g., unintentional weight loss, night sweats, severe pain,
neurological deficits).
Q13: What is the difference between a "probable" and a "possible"
diagnosis?
A: A probable diagnosis is supported by strong evidence and is the most likely
explanation. A possible diagnosis is on the differential but has less supporting
evidence or is less common.
Q14: Define "prevalence" and "incidence."
A: Prevalence is the total number of cases in a population at a given time.
Incidence is the number of new cases over a specific period.
Q15: How do prevalence and incidence affect your differential diagnosis?
A: Common things are common. A diagnosis with a high prevalence is more
likely to be the cause of a patient's symptoms than a rare one, all else being
equal.
Q16: What is the "test of treatment"?
A: A diagnostic strategy where a patient is treated for the most likely diagnosis
and their response to treatment helps confirm or refute that diagnosis.
, Q17: What is "anchoring bias" in diagnostic reasoning?
A: The tendency to lock onto the first piece of information (the "anchor") and
fail to adjust the differential as new data emerges.
Q18: What is "confirmation bias"?
A: The tendency to seek out and interpret new evidence as confirmation of one's
existing beliefs or hypotheses, while ignoring contradictory evidence.
Q19: What is the "hypothetico-deductive model" of diagnosis?
A: A model where the clinician generates early hypotheses based on initial data,
then deductively seeks specific information (history, exam, tests) to confirm or
eliminate those hypotheses.
Q20: Why is it crucial to consider a "worst-case scenario" differential?
A: To ensure that life-threatening or emergent conditions (e.g., aortic dissection,
meningitis, ectopic pregnancy) are ruled out before focusing on more benign
explanations.
Q21: What is a "syndrome"?
A: A collection of signs and symptoms that occur together and characterize a
particular abnormality or condition, but whose underlying cause may not be
fully understood (e.g., metabolic syndrome).
Q22: How do you prioritize your differential diagnosis?
A: 1. Most Dangerous (must rule out), 2. Most Likely (most common), 3. Most
Treatable.
Q23: What is "diagnostic momentum"?
A: The tendency for a diagnosis made by a previous clinician to be uncritically
accepted and perpetuated, preventing reconsideration of the diagnosis.
Q24: Define "sensitivity" and "specificity" of a diagnostic test.
A: Sensitivity is the ability of a test to correctly identify those with the disease
(true positive rate). Specificity is the ability to correctly identify those without
the disease (true negative rate).
Q25: How do you use a test with high sensitivity?
A: A highly sensitive test is best for ruling out a disease. If the test is negative,
you can be confident the patient does not have the disease (SnNout: Sensitive
test, Negative result, rules out).
Section 2: The General Survey & Vital Signs (Q26-Q35)
