CBC
ESR
TB test
MonoSpot
CXR
blood culture
ASLO
ANA
HIV
LP
blood culture again
Sinus/mastoid x-ray
Ophtho exam for iridocyclits
CMV, Toxo, Hep A/B, Tularemia, Brucellosis, Leptospirosis, Salmonellosis
LFTs
Abd ultrasound
Abd CT
Gallium/Indium scanning
UGI series with sbft
Bone marrow
Technetium bone scan
Fever of unknown origin
Infectious disease 
Acute fever
EBV
Neutropenic fever
UTI
Q fever
Enterovirus