The diagnosis of GABHS tonsillitis is mostly clinical but it can be confirmed by culture. Samples are obtained by swabbing both tonsillar surfaces and the posterior pharyngeal wall are plated on sheep blood agar medium.  The isolation rate can be increased by incubating the cultures under anaerobic conditions and using selective media.
Tonsillitis laboratory findings
Pharyngitis laboratory findings
Adenoiditis laboratory findings
Rhinosinusitis laboratory findings
Rhinitis laboratory findings
Esophagitis laboratory findings
Urticaria laboratory findings
Tonsillitis physical examination