The examination of the pulmonary system is a fundamental part of the physical examination that consists of inspection, palpation, percussion, and auscultation (in that order). Recognition of surface landmarks and their relationship to underlying structures is essential. The physical examination of the pulmonary system begins with the patient seated comfortably on the examination table and his/her upper body completely exposed. The chest and the patient's breathing pattern are then inspected, followed by palpation of the chest wall, percussion of the thorax, and auscultation of the lung fields. A carefully recorded medical history and thorough physical examination allow for differential diagnosis and prompt initiation of therapy.
See also differential diagnoses of dyspnea.
The following should be assessed:
- Normal respiratory rates
- Respiratory rate > 20/min, shallow breathing in adults
- > 60/min in pediatric patients
- Hyperpnea: respiratory rate > 20/min, deep breathing
- Inspiratory:expiratory ratio: The ratio of the inspiratory time to expiratory time during spontaneous breathing, which is normally 1:2.
- Common abnormal patterns of breathing include: 
- Cheyne-Stokes breathing: alternating periods of deep breathing followed by apnea
- Ataxic breathing: irregular breathing in rhythm and depth
- Obstructive breathing: prolonged exhalation
Increased effort of breathing
- Use of accessory muscles of respiration during inspiration
- Trachea off midline
- Tripod position: patients with emphysema and respiratory distress will lean forward while sitting, resting with their hands on their knees.
Peripheral signs of respiratory dysfunction
Nail clubbing 
- Definition: Nail clubbing is a physical finding characterized by painless swelling of the distal phalanges typically associated with chronic hypoxemia.
- Respiratory conditions, such as:
- Cardiovascular conditions, such as:
- Infections, such as:
- : a syndrome (either hereditary or paraneoplastic) that manifests with painful nail clubbing, synovial effusions, and periostitis
- Not associated with COPD, asthma
- Painless swelling of connective tissue in the distal phalanges
- Lovibond angle ≥ 180°: angle between the base of the nail and its surrounding skin
- Nail bed feels spongy when pressed and springs back when released.
- Schamroth test
Abnormalities in the shape of the thorax
- The anteroposterior diameter of the thorax may increase in COPD, leading to a “barrel chest” appearance.
- Retraction of the intercostal spaces
- Asymmetric movement may be associated with pleural disease, phrenic nerve damage, or pleural effusion.
- Kyphosis or scoliosis may lead to decreased forced vital capacity, forced expiratory volume and overall respiratory function
Sputum production or secretions, if any
- White and translucent: viral infection (for example, bronchitis that presents with a typical early-morning cough)
- White and foamy: pulmonary edema
- Yellow-green: bacterial infection
- Green: an indication of a pseudomonal infection
- Grayish: pneumoconiosis, a waning bacterial infection
- Blackish-brown: possibly old blood; should be further investigated (can also be a harmless incidental finding)
- Friable: tuberculosis, actinomycosis
- : see section below
- Jugular, sternal, and intercostal retraction
- Nasal flaring or flaring of the nostrils
- Neck extension
- Expectoration of blood
- Massive hemoptysis: 100–600 mL of coughed up blood in 24 hours
Approach for massive hemoptysis
- Dependent positioning if side of bleeding can be identified (e.g., position the patient in right-side down decubitus position if the right lung is bleeding)
- Secure airway (intubation)
- Stabilize cardiovascular function (IV fluids/transfusion)
- Stop bleeding (correct coagulopathy, flexible bronchoscopy with balloon tamponade, arteriography with embolization if other measures fail)
- Evaluate areas of tenderness or bruising
- Symmetry of chest expansion
- Tactile fremitus
- Hyperextend the nondominant middle finger and place the distal interphalangeal joint against the chest wall.
- Strike the joint with the other middle finger and evaluate the elicited sound.
- Always percuss both sides of the chest at the same level. Often the finding of asymmetry is more important than the specific percussion note that is heard.
- Physiological finding: resonant percussion note → a comparatively hollow and loud note
- Pathological findings
Assess diaphragmatic movement
- Move downwards while percussing over both sides of the chest wall.
- The transition point from resonant to dull percussion notes marks the approximate position of the diaphragm.
- Abnormally high transition points on one side may be seen in unilateral pleural effusion and unilateral diaphragmatic paralysis.
- The distance between the transition point on full expiration and the transition point on full inspiration is the extent of diaphragmatic excursion (normally 3.0-cm–5.5-cm).
Physiological breath sounds
- Soft and low pitched, through inspiration and part of expiration
- Heard over both lungs
- Intermediate intensity and pitch, through both inspiration and expiration
- Heard over 1st and 2ndintercostal spaces
- Loud and high pitched, through part of inspiration and all of expiration
- Heard over the sternum
- Very loud and high pitched, through both inspiration and expiration
- Heard over the neck
Pathological breath sounds
- Also known as adventitious or added sounds
- Consider secretions (such as in bronchitis) if breath sounds clear after coughing
Types of pathological breath sounds
- Crackles or rales: discontinuous, intermittent
- Wheezes (sibilant wheezing): musical, prolonged
- Rhonchi (sonor wheezing): low-pitched, snoring
Stridor: high-pitched, over trachea which may occur on:
- Inspiration (inspiratory stridor): narrowing of the extrathoracic airway; characteristic of epiglottitis, pseudocroup, foreign body aspiration, bilateral vocal cord palsy
- Expiration (expiratory stridor): obstruction of the intrathoracic airways; characteristic of bronchial asthma, COPD
- Inspiration and expiration (biphasic stridor): obstruction at the level of the glottis
- Pleural friction rub: scratchy, high-frequency sound
- Muffled or absent breath sounds: suggest presence of air or fluid between the lung and the chest wall
- Whispered pectoriloquy
|Main symptom||Tactile fremitus||Percussion||Auscultation (breath sounds)||Tracheal deviation|
|Pleural effusion||Dyspnea may be present||Decreased||Dull||Decreased||To the opposite side of the lesion (no deviation in small effusions)|
|Pulmonary edema|| |
|Possibly increased||Dull||Fine or coarse crackles, depending on severity||None|
|Simple pneumothorax||Acute dyspnea||Decreased or absent||Hyperresonant|| |
Decreased or absent
|Tension pneumothorax||Severe dyspnea||Decreased or absent||Hyperresonant||Decreased or absent||To the opposite side of the lesion|
|Bronchial asthma1||Paroxysmal attacks of dyspnea, wheezing|| |
Wheeze, a prolonged expiratory phase, possibly decreased breath sounds
|Chronic bronchitis1||Chronic cough||Decreased||Hyperresonant|| |
|Emphysema||Chronic dyspnea||Decreased||Hyperresonant||End-expiratory wheezing, decreased breath sounds||None|
|Pneumonia2||Fever, dyspnea||Increased||Dull|| |
|Lung fibrosis||Cachexia and weakness, dyspnea||Normal or slightly increased|| |
|Basal inspiratory crackles||To the side of the lesion|
|Atelectasis||Pain may be present||Decreased||Dull||Decreased||To the side of the lesion|
|Pulmonary embolism1|| |
|Possibly dull||Possibly decreased||To the opposite side of the lesion|
The following conditions frequently complicate the aforementioned pulmonary disease: 1pneumonia, 2pleural effusion, 3atelectasis.
See also dyspnea.