Criteria for Hospital Admission in Upper Respiratory Tract Infections (URTI)

Clinical Signs Requiring Hospital Admission

The European Respiratory Society recommends hospital admission for patients with URTI who show signs of severe illness, including temperature <35°C or ≥40°C, heart rate ≥125 beats/min, respiratory rate ≥30 breaths/min, cyanosis, blood pressure <90/60 mmHg, or confusion or diminished consciousness 1, 2, 3, 4
Patients with suspected pleural effusion or cavitation, metastatic infection, or failure to respond to appropriate antibiotic therapy should be considered for hospital admission 1, 3, 4, 5

The European Respiratory Society identifies age-related factors, such as elderly patients (>65 years) with pneumonia and elevated risk of complications, as warranting hospital admission 3, 4, 5
Comorbidities, including diabetes mellitus, heart failure, moderate to severe COPD, liver disease, renal disease, malignant disease, and immunocompromised status, increase the risk of complications and warrant hospital admission 1, 2, 4, 5, 6

Blood test abnormalities, such as leukopenia, severe leukocytosis, anemia, renal impairment, arterial blood gas abnormalities, acidosis, and coagulation abnormalities, are indicative of severe disease and warrant hospital admission 2, 4, 6
Radiological findings, including multilobar involvement, pleural effusion, and cavitation on chest radiograph, are also indicative of severe disease and warrant hospital admission 2, 4, 6

Immunocompromised patients require a lower threshold for admission due to their increased risk of atypical presentations, unusual pathogens, and rapid deterioration 3, 6

Patients with severe respiratory failure, including respiratory rate >30 breaths/min, PaO₂/FiO₂ <250 mmHg, need for mechanical ventilation, and radiographic spread of pneumonia, should be considered for ICU admission 2
Patients with severe hemodynamic instability, including systolic blood pressure <90 mmHg or diastolic <60 mmHg, need for vasoactive drugs, and urine output <20 mL/h, should also be considered for ICU admission 2, 4, 5
Patients with severe metabolic or hematologic abnormalities, including severe acidosis, disseminated intravascular coagulation, and acute renal failure requiring dialysis, should also be considered for ICU admission 2, 4

The European Respiratory Society recommends hospital management for patients with WBC count >20,000 cells/mm³, as it is a biological criterion for hospital management 7
Leukopenia is an absolute indication for hospital admission in patients with pneumonia symptoms, as it consistently predicts excess mortality, increased risk of acute respiratory distress syndrome, and delayed or masked manifestations of septic shock 8, 9, 10
The American College of Physicians and other medical societies imply that a WBC count <4,000 cells/mm³ or >20,000 cells/mm³ should prompt strong consideration for hospitalization, due to increased mortality and complications 7, 8, 9

The hospitalization decision should incorporate additional high-risk features, such as septic shock requiring vasopressors, and the presence of multiple minor criteria, including respiratory rate ≥30 breaths/min, PaO₂/FiO₂ ratio ≤250, and confusion/disorientation 8, 9, 10
The Infectious Diseases Society of America suggests that patients with pneumonia should be evaluated for severity of illness, using criteria such as WBC count, vital signs, and presence of comorbidities, to determine the need for hospitalization 8, 9, 10

Elderly patients (>65 years) with pneumonia should have a lower threshold for admission, particularly when combined with comorbidities such as diabetes mellitus, heart failure, COPD, chronic renal failure, chronic liver disease, and malignancy 8, 9

The European Respiratory Society and other medical societies recommend a step-wise approach to determining the need for hospitalization, including measurement of WBC count, assessment of vital signs and comorbidities, and evaluation for minor severity criteria 7, 8, 9, 10