Respiratory System Examination

Last updated: June 4, 2025

Presenting Complaints

  • Cough
    • Duration of cough?
    • Character?
      • Loud, brassy: pressure on the trachea
      • Hollow, ‘bovine’: recurrent laryngeal palsy
      • Barking: croup
      • Chronic: pertussis, Tuberculosis, foreign body, asthma
      • Dry, chronic: GERD, ACEi
    • Timing?
    • Exacerbating factors?
    • Sputum? (colour and amount)
    • Blood? (hemoptysis)
  • Hemoptysis
    • Contact with persons with chronic cough? Night sweats and fever? (Tuberculosis)
    • Weight loss? (malignancy)
    • Mixed with sputum?
    • Not mixed with sputum? (pulmonary embolism, trauma, bleeding into lung cavity)
    • Vomiting blood?
    • Dark stools? (can occur if a significant amount of coughed up blood is swallowed)
  • Dyspnoea Subjective sensations of shortness of breath, often exacerbated by exertion
    • Duration?
    • Steps climbed or distance walked before onset?
    • NYHA classification?
    • Diurnal variation? (asthma)
    • Circumstance in which dyspnea occurs?
  • Chest pain
    • SOCRATES
    • Worse on inspiration (pleuritic)
  • Respiratory risks
    • Pets at home
    • Foreign travel
    • Exposure to asbestos
    • Exposure to persons with cough
  • VTE risk factors
    • Calf swelling
    • Recent surgery or travel
    • OCPs or recent clots in the legs
  • Cancer complications
    • Hoarseness (laryngeal palsy)
    • Back pain (metastasis)
    • flushing or diarrhea (carcinoids)
  • Associated symptoms
    • Hoarseness
    • Wheeze
  • Constitutional symptoms
    • Fever
    • Weight loss
    • Fatigue
    • Loss of appetite
    • Night sweats

Physical Examination

Is the patient in obvious respiratory distress? Is there cyanosis? Is there wasting? Does the patient use pursed lips when breathing? Is the patient on oxygen/nebulizer/inhaler/drip? Does the patient have pallor/cyanosis?

General Inspection

Look for a bedside sputum pot

Sputum characteristicsCause
Yellow/greenInfection
Copious amountsBronchiectasis
Blood in sputumInfection, Cancer, Pulmonary embolism
Black carbon specksSmoking
ClearProbably saliva
Pink frothyPulmonary oedema
  • Respiratory distress in adults
    • Use of accessory muscles of breathing
    • Breathing through pursed lips
    • “Tripod” (Orthopneic) position
  • Respiratory distress in paedatric patients
    • Flaring of alae nasi
    • Central cyanosis + mouth breathing
    • Tracheal tug
    • Use of accessory muscle (head nodding)
    • Stridor
    • Lower chest wall indrawing (subcostal recession(
    • Xiphoid retraction
    • Intercostal recessions
  • Where do you check for cyanosis?
    • Central cyanosis: base of the tongue
    • Peripheral cyanosis:
  • How would you expect the expiratory time to change in lung disease?
    • Prolonged
  • Are audible breath sounds normal in healthy individuals?
    • No…
  • Conditions associated with finger clubbing ***suppurative diseases
    • Congenital cyanotic heart disease (95%)
    • Pulmonary fibrosis (75%)
    • Bronchiectasis (30%)
    • Non-small cell lung cancer (25%)
    • Empyema
    • Abscesses
    • Respiratory
      • Suppurative disease: CF, empyema, bronchiectasis, non-small cell carcinoma, cryptogenic fibrosing alveolitis
      • Rare: Lung abscess, mesothelioma, empyema, asbestosis
    • Cardiac
      • Common: Atrial myxoma
      • Rare: Congenital cyanotic heart disease, infective endocarditis
    • Gastrointestinal
      • Common: IBD, Coeliac’s disease
      • Rare: Cirrhosis
    • Others

Grading of finger clubbing

GradeAppearance
Grade INail bed fluctuation
Grade 2Obliterated Lovibon
Grade 3Parrot beaking
Grade 4Hypertrophic Osteoarthropathy (HOA – looks like a drum stick)
Finger clubbing
Finger clubbing

Inspection

Inspection of the hands

SignCause
Tar staining
Dupuytren’s contracture
Asterixis
Coarse flapCO2 retention
Fine tremorSalbutamol (Beta 2 agonist)
Warm sweaty palmsCO2 retention
KoilonychiaIron Deficiency Anaemia
LeukonychiaHypoalbuminemia
Beau’s linesSerious illness in the past 3 months
Splinter hemorrhagesEndocarditis, Trauma in manual labour

Inspection of the face

Does the patient have cyanosis? Does the patient have conjunctival pallor? Does the patient have scleral jaundice?

SignCause
Horner’s sign***Drooped eyelids and anhydrosis – Ipsilateral Pancoast tumor
Corneal arcusOld age, Wilson’s disease
Angular stomatitisIDA, Pernicious anaemia
GlossitisIDA, Pernicious anaemia
Acetone breathKetones
Dental state
Thrush and leukoplakiaImmunosuppression, Linked with chest infections (Pulmonary tuberculosis, Pneumocystis pneumonia)
Freckles on the lipsPeutz-Jeghers Syndrome
Buccal pigmentationAddison’s disease
OchronosisAlkaptonuria
General signs of swellingSVC obstruction (thrombosis, lung carcinoma) – Loss of JVP, swollen head and neck, arms spared by collateral circulation, visible distended veins on the chest wall

Inspection of the neck

SignCause
Hard lymphadenopathyMalignancy
Soft, tender, rubbery lymphadenopathyTuberculosis, Mononucleosis, CMV, HIV, Local viral infection, Syphilis, Brucellosis, Local bacterial infection, Toxoplasmosis, Sarcoidosis

Inspection of the Chest

  • Respiratory rate: assess without the patient knowing as this can make them nervous
  • Chest Shape
  • Chest Size
  • Chest Movement
  • Scars and Masses
  • Gynecomastia or Indentations of the breast
  • Chest deformities
    • Pectus excavatum: depressed sternum – Marfan syndrome; is cosmetic
    • Pectus carinatum: Prominent sternum – Rickets; is cosmetic
    • Kyphoscoliosis: idiopathic; quite severe and causes breathlessness in middle age
    • Thoracoplasty: past treatment for TB where ribs were removed; reduced lung capacity and can cause breathlessness in old smokers

Palpation

  • Chest expansion: Upper then lower chest, remember to check front then back, hands should go under the breasts
  • Tactile fremitus: loudspeaker effect on consolidation
    • Increased tactile fremitus: consolidation
    • Decreased tactile fremitus: empyema, pneumothorax, pleural effusion
  • Precordium: not useful in the respiratory exam but just palpate
  • Crepitus: accompanied by tenderness in rib fractures, and may coexist with pneumothorax or hemothorax. Rarely pathological fractures from cancer
  • Generalized swelling of the head and neck with crackling sensation under palpation: Subcutaneous emphysema
  • Apex beat
  • Axillary nodes: drain breast and pleura. >1cm is pathlogical
    • Hard lump: breast Ca, rarely mesothelioma
    • Firm lump: applies to other lymph node pathologies as well

Percussion

SignCause
HyperresonantPneumothorax, Hyperinflation in COPD
Normal resonanceNormal chest
DullConsolidation, Collapse, Fibrosis
Stony dullPleural effusion

Auscultation

Breath sound

SignCause
Vesicular breath soundRustling quality. Normal
Diminished (Quieter than normal) breath soundsCOPD and asthma, mild fibrosis, consolidation, collapse, pneumothorax, pleural effusion, obesity
BronchovesicularBronchial breath sounds heard at the apices
Silent chestStatus asthmaticus
Bronchial breath soundsHarsh breath sounds with a gap between inspiration and expiration. Consolidation, Fibrosis, Collapse
WheezeDue to air expired through narrow airways
Monophonic Wheeze (Rhonchi)Tumor occluding airway, unilateral foreign body
Polyphonic Wheeze (Rhonchi)Asthma, COPD, Cardiac asthma
Crackles (Crepitations)Due to reopening of small airways on inspiration
Fine cracklesPulmonary oedema
Coarse cracklesBronchiectasis
Early inspiratory cracklesSmall airway disease
Crackles that disappear after coughingInsignificant
Pleural friction rubPneumonia, Pulmonary infarct, malignancy

Vesicular vs Bronchial Breath Sounds

VesicularBronchial
QualityQuiet; RustlingHarsh, Blowing
Origin of inspiratory soundAlveoliBronchi
Origin of expiratory soundAlveoliBronchi
Louder componentInspiratoryExpiratory
Longer componentInspiratoryExpiratory
GapBetween expiration and inspirationBetween inspiration and expiration

Demonstration

Reference Intervals
Biochemistry
ACTHP: <80 ng/L
ALTP: 5–35 U/L
AlbuminP: 35–50 g/L
AldosteroneP: 100–500 pmol/L
Alk. phosphataseP: 30–130 U/L
α-AmylaseP: 0–180 IU/dL
α-FetoproteinS: <10 kU/L
Angiotensin IIP: 5–35 pmol/L
ADHP: 0.9–4.6 pmol/L
ASTP: 5–35 U/L
BicarbonateP: 24–30 mmol/L
BilirubinP: 3–17 μmol/L
BNPP: <50 ng/L
CRPP: <10 mg/L
CalcitoninP: <0.1 mcg/L
Calcium (ionized)P: 1.0–1.25 mmol/L
Calcium (total)P: 2.12–2.60 mmol/L
ChlorideP: 95–105 mmol/L
CholesterolP: <5.0 mmol/L
VLDLP: 0.128–0.645 mmol/L
LDLP: <2.0 mmol/L
HDLP: 0.9–1.93 mmol/L
Cortisol AMP: 450–700 nmol/L
Cortisol MidnightP: 80–280 nmol/L
CK ♂P: 25–195 U/L
CK ♀P: 25–170 U/L
CreatinineP: 70–100 μmol/L
FerritinP: 12–200 mcg/L
FolateS: 2.1 mcg/L
FSHP: 2–8 U/L ♂; >25 menopause
GGT ♂P: 11–51 U/L
GGT ♀P: 7–33 U/L
Glucose (fasting)P: 3.5–5.5 mmol/L
Growth hormoneP: <20 mu/L
HbA1C (DCCT)B: 4–6%
HbA1C (IFCC)B: 20–42 mmol/mol
Iron ♂S: 14–31 μmol/L
Iron ♀S: 11–30 μmol/L
Lactate (venous)P: 0.6–2.4 mmol/L
Lactate (arterial)P: 0.6–1.8 mmol/L
LDHP: 70–250 U/L
LHP: 3–16 U/L
MagnesiumP: 0.75–1.05 mmol/L
OsmolalityP: 278–305 mosmol/kg
PTHP: 0.8–8.5 pmol/L
PotassiumP: 3.5–5.3 mmol/L
Prolactin ♂P: <450 U/L
Prolactin ♀P: <600 U/L
PSAP: 0–4 mcg/mL
Protein (total)P: 60–80 g/L
Red cell folateB: 0.36–1.44 μmol/L
Renin (erect)P: 2.8–4.5 pmol/mL/h
Renin (recumbent)P: 1.1–2.7 pmol/mL/h
SodiumP: 135–145 mmol/L
TBGP: 7–17 mg/L
TSHP: 0.5–4.2 mU/L
T4P: 70–140 nmol/L
Free T4P: 9–22 pmol/L
TIBCS: 54–75 μmol/L
TriglyceridesP: 0.50–2.3 mmol/L
T3P: 1.2–3.0 nmol/L
Troponin TP: <0.1 mcg/L
Urate ♂P: 210–480 μmol/L
Urate ♀P: 150–390 μmol/L
UreaP: 2.5–6.7 mmol/L
Vitamin B12S: 0.13–0.68 nmol/L
Vitamin DS: 50 nmol/L
Arterial Blood Gases
pH7.35–7.45
PaCO₂4.7–6.0 kPa
PaO₂>10.6 kPa
Base excess±2 mmol/L
Urine
Cortisol (free)<280 nmol/24h
Hydroxyindole acetic acid16–73 μmol/24h
Hydroxymethylmandelic acid16–48 μmol/24h
Metanephrines0.03–0.69 μmol/mmol cr.
Osmolality350–1000 mosmol/kg
17-Oxogenic steroids ♂28–30 μmol/24h
17-Oxogenic steroids ♀21–66 μmol/24h
17-Oxosteroids ♂17–76 μmol/24h
17-Oxosteroids ♀14–59 μmol/24h
Phosphate (inorganic)15–50 mmol/24h
Potassium14–120 mmol/24h
Protein<150 mg/24h
Protein/creatinine ratio<3 mg/mmol
Sodium100–250 mmol/24h
Haematology
WCC4.0–11.0 ×10⁹/L
RBC ♂4.5–6.5 ×10¹²/L
RBC ♀3.9–5.6 ×10¹²/L
Hb ♂130–180 g/L
Hb ♀115–160 g/L
PCV ♂0.4–0.54 L/L
PCV ♀0.37–0.47 L/L
MCV76–96 fL
MCH27–32 pg
MCHC300–360 g/L
RDW11.6–14.6%
Neutrophils2.0–7.5 ×10⁹/L (40–75%)
Lymphocytes1.0–4.5 ×10⁹/L (20–45%)
Eosinophils0.04–0.44 ×10⁹/L (1–6%)
Basophils0–0.10 ×10⁹/L (0–1%)
Monocytes0.2–0.8 ×10⁹/L (2–10%)
Platelets150–400 ×10⁹/L
Reticulocytes0.8–2.0% / 25–100 ×10⁹/L
Prothrombin time10–14 s
APTT35–45 s
Paediatric
Pulse Rate (bpm)
Neonate140–160
Infant <1yr120–140
1–5 years110–130
5–12 years80–120
>12 years70–100
Respiratory Rate (tachypnoea)
0–2 months≥60/min
2–12 months≥50/min
1–5 years≥40/min
>5 years≥30/min
Blood Pressure (mmHg)
Term65/45
1 year75/50
4 years85/60
8 years95/65
10 years100/70
Weight Formulas
3–12 months(a + 9)/2 kg
1–6 years2a + 8 kg
>6 years(7a − 5)/2 kg
Haemoglobin (g/dL)
Term newborn13–20
1 month11–18
2 months10–15
1–2 years10–13
>2 years11–14
MUAC (6 months–5 years)
Obese>17.5 cm
Normal13.5–17.4 cm
At risk12.5–13.4 cm
Moderate malnutrition11.5–12.4 cm
Severe malnutrition<11.5 cm
Developmental Milestones
Social smile1.5 months
Head control4 months
Sits unsupported7 months
Crawls10 months
Stands unsupported10–12 months
Walks12–13 months
Talks18 months
CSF WBC (/mm³)
Term newborn0–25
>2 weeks0–5
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