# Croup

Manage croup by recognizing impending upper-airway failure, separating viral disease from epiglottitis, bacterial tracheitis, and foreign body, then using corticosteroids for symptomatic disease and nebulized epinephrine for clinically important obstruction with repeated bedside reassessment.

**Clinical question:** How should physicians stratify, treat, observe, and escalate children presenting with suspected viral croup?

Updated: 2026-08-21T02:05:53.700761+00:00

## What matters in practice
- Make the initial assessment from a nonthreatening distance and minimize agitation; upper-airway obstruction can worsen rapidly, so serial clinical examinations are more important than a single assessment. [9]
- Rapid progression, high fever, toxic appearance, drooling, or absence of the characteristic brassy cough should redirect management toward epiglottitis, bacterial tracheitis, or another dangerous upper-airway process. [18][22]
- Systemic corticosteroids improve outcomes in croup; a single oral dexamethasone dose is supported for outpatient disease, and dexamethasone performs as well as nebulized budesonide in mild-to-moderate croup. [4][6][13]
- Use nebulized epinephrine for moderate-to-severe obstruction as temporizing therapy, not as a substitute for corticosteroid treatment or continued clinical reassessment. [5][16]

## Identify airway compromise before diagnostic testing

Severity is determined by airway obstruction and work of breathing, not by oxygen saturation alone.

Observe the child while seated with a caregiver and obtain the history without provoking distress. Assess stridor at rest, retractions, air entry, mental status, color, fatigue, and ability to handle secretions. Repeated examinations are necessary because upper-airway obstruction may progress rapidly. [9]

Pulse oximetry is useful as an adjunct but cannot exclude severe croup: oxygen saturation can remain near normal despite severe upper-airway obstruction, while lower saturations in otherwise mild-to-moderate presentations may reflect associated lower-airway disease. [9]

Treat a child with decreased air entry, cyanosis, altered consciousness, marked exhaustion, or progressive respiratory distress as impending respiratory failure. A Westley score greater than 12 suggests likely respiratory failure, although the score is used primarily in research rather than as a replacement for bedside assessment. [23]
- Keep the child calm; agitation can worsen airway edema and obstruction. [21]
- Give supplemental oxygen when hypoxemia or respiratory compromise is present, while preparing for escalation if air entry, color, or consciousness deteriorates. [10][23]
- Do not delay airway-focused management for routine viral testing; nasopharyngeal viral testing is not routinely required for clinical diagnosis. [21]

*Clinical severity bands can structure reassessment but do not replace serial airway examination. [9][23]*

| Severity indicator | Westley score | Immediate implication |
| --- | --- | --- |
| Mild | 2 or less [23] | No major distress signal; treat with corticosteroid and reassess clinical trajectory. [4][24] |
| Moderate | 3 to 5 [23] | Clinically significant obstruction; give corticosteroid and consider nebulized epinephrine when stridor or distress warrants temporary airway relief. [5][16] |
| Severe | 6 to 11 [23] | Escalate monitoring and use nebulized epinephrine with corticosteroid treatment; reassess closely for worsening air entry or fatigue. [5][16][23] |
| Impending respiratory failure | Greater than 12 [23] | Urgent airway-focused escalation; declining consciousness, cyanosis, or poor air entry outweigh any reassuring isolated oximetry value. [9][23] |

## Separate uncomplicated viral croup from alternate upper-airway emergencies

Typical croup is clinical; atypical features should change the airway plan and diagnostic target.

A barking or brassy cough with hoarseness and inspiratory stridor supports viral croup. The most consequential alternate diagnoses are epiglottitis, bacterial tracheitis, deep-neck infection, anaphylaxis or airway edema, and airway foreign body. [10][18][19]

High fever, rapid clinical progression, toxic appearance, drooling, and absent brassy cough are characteristic warning features for bacterial epiglottitis or tracheitis rather than uncomplicated viral croup. Avoid treating this pattern as routine croup simply because stridor is present. [18]

Failure to improve after nebulized epinephrine and corticosteroids should raise concern for bacterial tracheitis. It may complicate croup; lateral neck radiography may show tracheal mucosal-wall or air-column irregularity, described as a candle-dripping appearance, while chest radiography may identify concomitant pneumonia. [22]
- Drooling and tripod positioning favor epiglottitis over bacterial tracheitis; bacterial tracheitis generally causes less difficulty managing oral secretions. [22]
- Fever with drooling, muffled voice, and neck-space symptoms should prompt consideration of retropharyngeal or peritonsillar abscess. [22]
- Abrupt stridor after a choking event should prompt evaluation for an aspirated airway foreign body rather than empiric treatment as viral croup. [10]

*Features that should redirect the differential away from straightforward viral croup. [10][18][22]*

| Diagnostic branch | Discriminating pattern | Next action |
| --- | --- | --- |
| Viral croup | Barking or brassy cough, hoarseness, inspiratory stridor; clinical diagnosis is usually sufficient. [19][21] | Assess obstruction serially; give corticosteroid and add nebulized epinephrine for clinically important obstruction. [4][5][16] |
| Epiglottitis | Toxic appearance, high fever, rapidly progressive obstruction, drooling, and preference for tripod position; brassy cough is usually absent. [18][22] | Prioritize careful airway management and avoid provoking distress during evaluation. [9][21] |
| Bacterial tracheitis | Toxic presentation or worsening after standard croup therapy; tracheal wall or air-column irregularity may occur on lateral neck radiograph. [22] | Escalate airway assessment; obtain imaging only when it can be performed without compromising airway management. [22] |
| Deep-neck infection | Fever, drooling, muffled voice, or features of peritonsillar or retropharyngeal abscess. [22] | Shift evaluation toward the suspected neck-space process and airway risk. [10][22] |
| Foreign body or noninfectious edema | Acute stridor after aspiration exposure, or airway edema from anaphylaxis or instrumentation. [10] | Treat according to the suspected mechanism rather than a viral-croup pathway. [10] |

## Use testing selectively when presentation is atypical or dangerous

Routine laboratory and imaging studies are unnecessary for clinically typical croup.

Croup is primarily a clinical diagnosis. Nasopharyngeal viral cultures or aspirates can establish viral etiology but are generally confined to research settings and do not direct acute treatment. [21]

Obtain anteroposterior and lateral neck radiographs only when the diagnosis is uncertain and airway stability permits. A steeple sign or symmetric subglottic narrowing can support croup; a lateral thumb sign supports epiglottitis. Neither image should delay management of a child with suspected critical upper-airway obstruction. [8][10]

Chest radiography has limited diagnostic value for bacterial tracheitis but may show concurrent pneumonia, reported in approximately 50% of cases; concomitant pneumonia is associated with greater severity and a higher likelihood of endotracheal intubation. Computed tomography is typically not used for initial bacterial-tracheitis diagnosis. [22]
- Use pulse oximetry to detect hypoxemia, but interpret it with airway examination rather than as a severity surrogate. [9]
- Use a croup score, if employed, for standardized trend assessment rather than as the sole disposition tool. [9][23]
- Reconsider the diagnosis when there is recurrent croup, prior intubation, or age younger than 1 or 3 years with recurrent episodes; multidisciplinary airway evaluation, including otolaryngology, may be indicated. [21]

*Testing should answer a competing diagnostic question, not confirm clinically obvious croup. [8][10][21][22]*

| Test | When it changes management | Interpretation or limitation |
| --- | --- | --- |
| Pulse oximetry | Any child with concerning respiratory compromise or suspected hypoxemia. [9][10] | Normal saturation does not exclude severe croup; desaturation may reflect lower-airway involvement. [9] |
| AP and lateral neck radiographs | Atypical stridor when the airway is stable enough for imaging. [8][10] | Steeple sign supports croup; thumb sign supports epiglottitis. [10] |
| Chest radiograph | Suspected bacterial tracheitis with concern for pneumonia. [22] | May identify pneumonia but is otherwise of poor diagnostic value for bacterial tracheitis. [22] |
| Viral testing | Usually not needed for acute treatment decisions. [21] | Can establish etiology but is generally used in research settings. [21] |

## Use corticosteroids for symptomatic croup and epinephrine for temporary relief

Corticosteroids address the inflammatory process; nebulized epinephrine provides rapid but temporary improvement in obstruction.

Administer dexamethasone to children with croup requiring medical treatment. In a randomized trial of mild croup, a single oral dose accelerated symptom resolution, reduced lost sleep, and reduced parental stress. [4] High-quality trial evidence supports one outpatient dexamethasone dose, although inpatient repeat-dose strategies lack comparable trial evidence. [13]

For severe croup when the oral route is not feasible or when parenteral administration is needed, dexamethasone 0.6 mg/kg can be given parenterally; one study used a maximum of 8 mg. [11] Dexamethasone doses of 0.15 to 0.6 mg/kg have been used in croup studies and standard treatment descriptions. [14][16]

Nebulized budesonide is an alternative corticosteroid approach, but oral dexamethasone produced outcomes as good as nebulized budesonide alone or combined budesonide-dexamethasone in outpatients with mild-to-moderate croup. Dexamethasone is easier to administer, less expensive, and more widely available; do not add budesonide routinely to dexamethasone for a small score-only advantage. [6]

Use nebulized epinephrine for moderate-to-severe croup when rapid temporary reduction in airway obstruction is needed. In a randomized trial, both 0.1 mg/kg and 0.5 mg/kg of nebulized 1:1000 L-epinephrine improved croup scores by 30 minutes, and the lower dose was not inferior for score reduction; conventional dosing described in the study was 0.5 mg/kg to a maximum of 5 mg. [16] Pair epinephrine with dexamethasone rather than relying on temporary symptom relief alone. [5][12]
- Mild disease: a single oral corticosteroid dose may be beneficial even when disease is otherwise self-limited. [24]
- Moderate-to-severe disease: give dexamethasone plus nebulized epinephrine when obstruction requires immediate symptom relief. [5][16]
- Severe disease with inability to take oral medication: use parenteral dexamethasone 0.6 mg/kg; the cited study used a maximum of 8 mg. [11]
- Do not substitute humidified air for evidence-based drug therapy; corticosteroids are the mainstay of treatment. [5][20]

### Medication selection

Choose oral dexamethasone when the child can tolerate oral medication because its outpatient clinical outcome is comparable to nebulized budesonide, including when budesonide and dexamethasone are combined. [6] Use nebulized epinephrine when the immediate problem is stridor or respiratory distress from upper-airway obstruction, then reassess because its benefit is temporary. [5]

*Medication choices by clinical objective. [4][5][6][11][16][24]*

| Clinical objective | Agent and source-supported regimen | Expected role |
| --- | --- | --- |
| Reduce symptoms and improve course in mild outpatient croup | Single oral dexamethasone dose; doses of 0.15 to 0.6 mg/kg have been studied. [4][14][16] | Improves clinical course; do not require nebulized therapy solely because croup is present. [4][6][24] |
| Provide corticosteroid treatment when oral route is unsuitable in severe disease | Parenteral dexamethasone 0.6 mg/kg; one study used maximum 8 mg. [11] | Systemic anti-inflammatory treatment when severe disease or route limitations preclude oral dosing. [11] |
| Temporize moderate-to-severe obstruction | Nebulized 1:1000 L-epinephrine 0.5 mg/kg, maximum 5 mg, is the conventional regimen described in a randomized trial; 0.1 mg/kg was not inferior for croup-score reduction at 30 minutes. [16] | Rapid, temporary relief of obstruction; combine with corticosteroid therapy and reassessment. [5][12][16] |
| Alternative corticosteroid delivery | Nebulized budesonide. [6] | Comparable outpatient outcome to oral dexamethasone but no demonstrated advantage for routine combination therapy. [6] |

## Base disposition on recurrent obstruction and serial airway findings

The key post-treatment decision is whether upper-airway obstruction remains controlled without progression.

After nebulized epinephrine, repeat assessment of stridor at rest, retractions, air entry, oxygenation, color, and mental status. Epinephrine is effective for temporary relief, so clinical improvement shortly after treatment does not eliminate the need to observe for recurrent obstruction or an alternative diagnosis. [5][9][16]

Escalate care for persistent or worsening stridor at rest, increasing retractions, diminished air entry, cyanosis, fatigue, altered consciousness, inability to tolerate oral intake because of respiratory distress, or a toxic febrile presentation. In these situations, prioritize airway management and reconsider bacterial tracheitis, epiglottitis, deep-neck infection, or foreign body. [18][22][23]

Children with recurrent croup merit evaluation for structural or acquired airway disease. Otolaryngology involvement is appropriate within a multidisciplinary assessment; children younger than 1 or 3 years with recurrent croup and a history of intubation have been identified as a group for consideration of triple endoscopy. [21]
- Do not use a normal pulse oximetry value as the only discharge criterion; severe upper-airway obstruction may occur with near-normal saturation. [9]
- Treat nonresponse to epinephrine and corticosteroids as a diagnostic signal, particularly for bacterial tracheitis. [21][22]
- When bacterial tracheitis is suspected, concurrent pneumonia increases severity and likelihood of intubation. [22]

*Disposition is driven by the post-treatment airway trajectory rather than the initial label alone. [5][9][18][21][22][23]*

| Post-treatment pattern | Disposition implication | Diagnostic reconsideration |
| --- | --- | --- |
| Improved clinical obstruction without concerning airway signs | Continue clinically guided reassessment after treatment. [5][9] | Typical viral croup remains likely when barking cough and characteristic course are present. [18][19] |
| Persistent or recurrent stridor at rest, retractions, or poor air entry | Escalate monitoring and airway-focused care. [9][23] | Assess for severe viral croup and alternate obstructive processes. [10][18] |
| Toxic appearance, high fever, rapid progression, drooling, or absent brassy cough | Do not manage as routine croup; prioritize careful airway management. [18] | Epiglottitis, bacterial tracheitis, or deep-neck infection. [18][22] |
| Recurrent episodes, especially with young age or prior intubation | Arrange multidisciplinary airway assessment, including otolaryngology. [21] | Consider congenital or acquired airway abnormalities. [21] |

## References
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## Editorial note

Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.