Rapid strep throat swab
Heterophile antibody (monospot) test
If patient is ill appearing consider:
CBC
CMP
Blood culture
Imaging
If concern for epiglottitis
Lateral neck x-ray
If concern for retropharyngeal abscess
CT neck with contrast
CBC
CMP
Blood culture
If concern for epiglottitis
Lateral neck x-ray
If concern for retropharyngeal abscess
CT neck with contrast
Lateral neck x-ray
CT neck with contrast
Uvulitis
Appendicitis 
Infectious
Appendicitis
Group A Streptococcus
Cervicitis
H. Influenza
Orchitis