T T&A Tonsillectomy and adenoidectomy T1, T2, and so on first thoracic vertebra, second and so on thoracic vertebra, and...

S ¯s without S1, S2, and so on first sacral vertebra, second sacral and so on vertebra, and so on...

Q qAM* every morning q.2h.* every 2 hours q.d.* every day qEEG quantitative electroencephalography q.h.* every hour q.i.d.* four times...

P P Phosphorus; pulse ¯p after PBI Protein-bound iodine PCO2 Partial pressure of carbon dioxide PID Pelvic inflammatory disease PA...

O O2 Oxygen OB Obstetrics OCPs Oral contraceptive pills OD Overdose O.D. Doctor of Optometry OD* right eye OM Otitis...