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Purdue University Globle
NU552 Advanced Health Assessment Course Module Overview
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Date
Diagnostic reasoning and clinical judgment are essential components of safe, evidence-based nursing practice. When evaluating a patient with a cough, healthcare providers should combine the patient’s history, objective physical assessment, risk factors, and current clinical guidelines to identify the most likely cause and determine whether additional diagnostic testing is needed. A systematic approach helps nurses and other clinicians distinguish common causes of cough from conditions that require more urgent evaluation.
Ms. Jordan is a young, healthy-appearing woman who is well groomed and physically fit. She presents with a pleasant mood and appears alert and oriented. She shows no evidence of acute distress during the examination.
The head is normocephalic and without evidence of trauma. Hair texture appears normal. The sclerae are white, and the conjunctivae are pink. Pupils are equal, round, and reactive to light and accommodation (PERRLA), measuring approximately 4 mm before constricting to 2 mm. Fundoscopic examination shows no hemorrhages, exudates, or arteriolar narrowing.
The ears show no obvious hearing impairment, and both tympanic membranes demonstrate a normal cone of light. The nasal mucosa is pink, the septum is midline, and there is no sinus tenderness. The oral mucosa is pink, dentition is good, and the pharynx is free of erythema and exudate.
The trachea is midline, and the neck is supple. The thyroid isthmus is palpable, while the thyroid lobes are neither enlarged nor readily palpable. No cervical, axillary, epitrochlear, or inguinal lymphadenopathy is identified.
There is no jugular venous distention (JVD). Carotid pulses are brisk, with no audible bruits. Heart sounds S1 and S2 are normal, and no murmurs, gallops, or other additional heart sounds are detected.
The thorax is symmetrical, with appropriate chest expansion during respiration. Percussion produces normal resonance over the lung fields. Vesicular breath sounds are present throughout, with no wheezes, crackles (rales), or rhonchi.
These findings do not demonstrate obvious abnormal respiratory sounds or signs of acute respiratory distress. However, a normal lung examination does not by itself exclude conditions that can cause persistent or chronic cough.
The skin is warm, dry, and intact. The nails show no evidence of clubbing or cyanosis. No rashes, lesions, or abnormal discoloration are observed.
Diagnostic reasoning is a systematic process used by healthcare professionals to organize patient information, identify potential diagnoses, and determine the next appropriate clinical steps. For a patient presenting with a cough, the evaluation begins with a detailed history and physical examination.
One of the most important factors is the duration of the cough. Cough is commonly classified as acute, subacute, or chronic based on how long it has been present. Establishing the duration helps narrow the differential diagnosis and guides decisions about further evaluation.
The patient’s history should address the onset and characteristics of the cough as well as associated symptoms. Healthcare providers should also consider medication use, smoking or vaping history, occupational and environmental exposures, allergies, and relevant medical conditions.
Important history questions may address:
When did the cough begin?
Is the cough dry or productive?
Is sputum present, and if so, what is its character?
Are there associated symptoms such as fever, wheezing, dyspnea, chest pain, or weight loss?
Does the cough occur primarily at night or after meals?
Is the patient taking medications known to cause cough?
Does the patient smoke or have exposure to secondhand smoke?
Are there occupational, environmental, or allergen exposures?
Combining these findings allows the clinician to develop a differential diagnosis rather than focusing on a single possible cause.
Clinical judgment builds on diagnostic reasoning by requiring the healthcare provider to interpret assessment findings and determine what action is most appropriate. In nursing practice, clinical judgment involves recognizing relevant findings, analyzing their significance, identifying possible explanations, and deciding whether additional assessment or intervention is necessary.
For a patient with persistent or chronic cough and an otherwise unremarkable physical examination, several common causes should be considered. These include:
Upper airway cough syndrome, often associated with postnasal drainage
Asthma, including cough-variant asthma
Gastroesophageal reflux disease (GERD)
Medication-induced cough, particularly cough associated with angiotensin-converting enzyme (ACE) inhibitors
Other pulmonary conditions that may require additional diagnostic evaluation
The patient’s history and examination findings help determine which possibilities are most likely. For example, symptoms of nasal drainage or throat clearing may support an upper airway cause, whereas episodic cough associated with wheezing or triggers may raise suspicion for asthma. Reflux symptoms or cough that occurs after meals may suggest GERD.
Clinical guidelines emphasize that the evaluation of cough should be individualized according to the patient’s symptoms, duration, risk factors, and examination findings. For adults with chronic cough, clinicians should consider common causes first while remaining alert for symptoms that could indicate a more serious underlying condition.
A medication review is particularly important because some medications can produce cough. ACE inhibitors are a well-established example. If the clinical history suggests medication-induced cough, the healthcare provider should consider whether the medication could be contributing to the patient’s symptoms.
Diagnostic testing should also be guided by the clinical presentation rather than performed indiscriminately. Depending on the patient’s history and risk factors, evaluation may include chest radiography, pulmonary function testing, or other targeted investigations.
The American Academy of Family Physicians notes that adults with chronic cough should be evaluated systematically, with attention to common etiologies such as upper airway cough syndrome, asthma, GERD, and medication-related causes (Irwin et al., 2017).
The objective assessment findings provide important information for clinical reasoning. Ms. Jordan’s normal respiratory examination, absence of lymphadenopathy, normal cardiovascular findings, and lack of acute distress reduce concern for some immediately apparent serious conditions. Nevertheless, these findings should be interpreted alongside the patient’s history rather than considered in isolation.
A normal physical examination can occur in patients with conditions such as asthma, GERD-related cough, or upper airway cough syndrome. Therefore, the absence of wheezing, crackles, or rhonchi does not automatically eliminate these diagnoses.
Effective clinical judgment requires nurses to recognize both normal and abnormal findings and understand how they contribute to the overall clinical picture.
A structured approach can help nurses evaluate patients with cough more consistently. The process begins by collecting subjective and objective data, followed by identifying relevant patterns and potential causes.
The nurse should then determine whether additional assessment is necessary and communicate significant findings to the appropriate healthcare provider. Evidence-based guidelines can support decisions regarding diagnostic testing and treatment while reducing unnecessary interventions.
This approach demonstrates how assessment, clinical reasoning, and evidence-based practice work together. Rather than relying on a single symptom or examination finding, healthcare professionals consider the entire patient presentation before making clinical decisions.
Diagnostic reasoning and clinical judgment are closely connected but serve different functions. Diagnostic reasoning organizes clinical information and supports the development of a differential diagnosis, whereas clinical judgment uses that information to determine the most appropriate response.
When evaluating a patient with cough, nurses should:
Obtain a comprehensive health history.
Determine the duration and characteristics of the cough.
Perform a focused but thorough physical examination.
Review medications and relevant risk factors.
Consider common causes before less common conditions.
Recognize findings that may require further diagnostic evaluation.
Apply current evidence-based clinical guidelines.
Use clinical judgment to determine appropriate next steps.
A systematic approach improves the ability to identify potential causes of cough, recognize concerning findings, and support safe, patient-centered care.
Diagnostic reasoning helps clinicians organize subjective and objective information to develop a prioritized differential diagnosis. By considering cough duration, associated symptoms, medications, exposures, medical history, and physical examination findings, healthcare providers can identify likely causes and determine whether additional testing is appropriate.
Clinical judgment involves interpreting patient information and deciding what actions are appropriate based on the patient’s condition and available evidence. It helps healthcare providers determine whether further assessment, diagnostic testing, treatment, monitoring, or referral is warranted.
Common causes of chronic cough in adults include upper airway cough syndrome, asthma, gastroesophageal reflux disease, and ACE inhibitor use. Other pulmonary conditions should also be considered when symptoms, risk factors, or examination findings indicate the need for additional investigation.
Yes. A normal respiratory examination does not rule out every potential cause of cough. Conditions such as asthma, GERD-related cough, and upper airway cough syndrome may occur without obvious wheezing, crackles, or rhonchi during the examination.
Clinical guidelines provide evidence-based recommendations that help standardize assessment and support appropriate diagnostic and treatment decisions. They can also help clinicians avoid unnecessary testing while ensuring that important causes of cough are not overlooked.
Diagnostic reasoning and clinical judgment are fundamental to evaluating patients with cough. A thorough assessment begins with the patient’s history and objective examination and then incorporates factors such as cough duration, medication use, exposures, associated symptoms, and risk factors. Ms. Jordan’s physical examination is largely normal, with no apparent acute respiratory or cardiovascular abnormalities.
For persistent or chronic cough, healthcare providers should consider common etiologies such as upper airway cough syndrome, asthma, GERD, and ACE inhibitor-associated cough. Evidence-based guidelines can help determine when diagnostic testing is appropriate and guide subsequent management.
Ultimately, effective clinical decision-making requires healthcare professionals to integrate patient-specific findings with current evidence rather than relying on an isolated symptom or examination result. This approach promotes accurate differential diagnosis, appropriate investigation, and safe, patient-centered care.
Irwin, R. S., Baumann, M. H., Bolser, D. C., Boulet, L. P., Braman, S. S., Brightling, C. E., Brown, K. K., Chang, A. B., Dicpinigaitis, P. V., Eccles, R., Gibson, P. G., Mazzone, S. B., & Pratter, M. R. (2017). Diagnosis and management of cough: ACCP evidence-based clinical practice guidelines. Chest, 129(1 Suppl.), 1S–292S. https://doi.org/10.1378/chest.129.1_suppl.1S
Smith, S., & Benbenek, M. M. (2025). Diagnostic reasoning. AACN Advanced Critical Care, 36(2), 106–108. https://doi.org/10.4037/aacnacc2025459
American Academy of Family Physicians. (2017). Evaluation of the patient with chronic cough. American Family Physician, 96(9), 575–580. https://www.aafp.org/pubs/afp/issues/2017/1101/p575.html
