The American Heart Association (AHA) diagnostic criteria for classic Kawasaki disease is a clinical calculator used to diagnose Kawasaki disease, a condition that primarily affects children and involves inflammation of the blood vessels. This scoring system is specifically applicable to pediatric patients, typically under the age of 5, who present with prolonged fever and other clinical signs suggestive of the disease.

The AHA criteria for Kawasaki disease include five main clinical features: fever lasting 5 or more days, bilateral non-exudative conjunctivitis, changes in the lips and oral cavity, changes in the extremities, and polymorphous exanthem. The presence of cervical lymphadenopathy is also considered. 

The clinical utility of this calculator is to aid in the diagnosis of Kawasaki disease, which can be challenging due to its nonspecific symptoms and the lack of a definitive diagnostic test. Early diagnosis is crucial as the disease can lead to serious complications, such as coronary artery aneurysms, if not treated promptly.

Exclusion criteria for the use of this calculator include patients who do not meet the fever duration requirement or those who have an alternative diagnosis that better explains the clinical presentation. Additionally, it should be noted that a certain percentage of patients may have "incomplete" or "atypical" Kawasaki disease,

American Heart Association diagnostic criteria for classic Kawasaki disease (AHA criteria)

# Criteria
 A. Fever (>= 5 days) (+2)
B. Changes of lips or oral mucosa (erythema and cracking of lips, strawberry tongue, and/or erythema of oral and pharyngeal mucosa) (+1)
C. Conjunctivitis (bilateral bulbar conjunctival injection without exudate) (+1)
D. Rash (maculopapular, diffuse erythroderma, or erythema multiforme-like) (+1)
E. Changes to extremities (erythema and swelling of the hands and feet in acute phase and/or periungual desquamation in subacute phase) (+1)
F. Cervical lymphadenopathy (>= 1.5 cm diameter, usually unilateral) (+1)

# Conditions
- score >= 6
- true
- score == 0

Diagnosis, Treatment, and Long-Term Management of Kawasaki Disease: A Scientific Statement for Health Professionals From the American Heart Association.