Updated: 2007
P24 antigen
a soluble antigen produced by HIV PCP
phencyclidine PCP
Pneumocystis jiroveci (formerly carinii) pneumonia PCR
polymerase chain reaction PEG-IFN
pegylated interferon PEP
postexposure prophylaxis PGL
persistent generalized lymphadenopathy PI
protease inhibitor PID
pelvic inflammatory disease PML
progressive multifocal leukoencephalopathy PND
paroxismal nocturnal dyspnea PO
by mouth; orally PPD
purified protein derivative (tuberculin skin test) PPI
proton pump inhibitor PPV
positive predictive value PRN
as needed (pro re nata) PSA
prostate specific antigen PWP
prevention with positives | 
