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The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained here.
This is a list of abbreviations used in medical prescriptions, including hospital orders (the patient-directed part of which is referred to as sig codes).This list does not include abbreviations for pharmaceuticals or drug name suffixes such as CD, CR, ER, XT (See Time release technology § List of abbreviations for those).
Pronunciation follows convention outside the medical field, in which acronyms are generally pronounced as if they were a word (JAMA, SIDS), initialisms are generally pronounced as individual letters (DNA, SSRI), and abbreviations generally use the expansion (soln. = "solution", sup. = "superior").
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Meaning R: respiration, (right) RA: refractory anemia rheumatoid arthritis right atrium room air RAD: reflex anal dilatation right axis deviation reactive airway disease radiation absorbed dose reactive attachment disorder: Rad hys: radical hysterectomy: RAE: right atrial enlargement RAI: radioactive iodine: RAIU: thyroid reactive iodine uptake ...
Past medical history (see also medical history) PSI: Pneumonia severity index: PSP: phenylsulphtalein: PSS: progressive systemic sclerosis (see scleroderma) PSVT: paroxysmal supraventricular tachycardia: PT: prothrombin time physical therapy (physiotherapy) Pt. patient (from Latin patiens, meaning "one who endures" or "one who suffers") PTA
Term Description (notes) A.d. As directed bd/bid Twice a day gt One drop gtt drops GSL General sales list Gutt/g Guttae (drops) Meds Medications Nocte/QHS At night Occ Ointment od/QD Once a day otc Over the counter (bought medication) P Pharmacy (drug) POM Prescription-only medicine prn When required q Every (e.g. q2h – every two hours) qds/qid
The positive predictive value (PPV), or precision, is defined as = + = where a "true positive" is the event that the test makes a positive prediction, and the subject has a positive result under the gold standard, and a "false positive" is the event that the test makes a positive prediction, and the subject has a negative result under the gold standard.