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Pro re nata is a Latin phrase meaning "in the circumstances" or "as the circumstance arises" (literally "for the thing born"). [1] [2] In medical terminology, it is often abbreviated PRN or P.R.N. and refers to the administration of prescribed medication as the situation calls for it.
Meaning [1] Latin (or Neo-Latin) origin [1] a.c. before meals: ante cibum a.d., ad, AD right ear auris dextra a.m., am, AM morning: ante meridiem: nocte every night Omne Nocte a.s., as, AS left ear auris sinistra a.u., au, AU both ears together or each ear aures unitas or auris uterque b.d.s, bds, BDS 2 times a day bis die sumendum b.i.d., bid, BID
take (often effectively a noun meaning "prescription"—medical prescription or prescription drug) rep. repetatur: let it be repeated s. signa: write (write on the label) s.a. secundum artem: according to the art (accepted practice or best practice) SC subcutaneous "SC" can be mistaken for "SL," meaning sublingual. See also SQ: sem. semen seed ...
PRN pro re nata "for the thing born" As used in standard medical jargon, PRN is understood to mean "as needed". This reading of the abbreviation implies that the delivery of the prescription (by a suitable person, following a medications protocol) is done in a reactive, passive way, e.g., "when that happens, do this".
Family medical history FOH: Family ocular history F/U: Follow up appointment GH: General health G(M)P: General (medical) practitioner HA: Headaches HARC: Harmonious abnormal retinal correspondence HM: Hand motion vision – state distance Hx: History IOL: Intra-ocular lens IOP: Intra-ocular pressure ISNT: Inferior, Superior, Nasal, Temporal
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").
Abbreviation Meaning pĚ„: after (from Latin post) [1] [letter p with a bar over it] pH Potential of Hydrogen - Acidity of a fluid P: parturition (total number of live births) phosphorus pulse [1] post P OSM: plasma osmolality PA: posterior–anterior, posteroanterior pulmonary artery [[physician assistant or associate [2]]] psoriatic arthritis ...
Pertactin (PRN), a virulent factor of the bacterium Bordetella pertussis Pro re nata ( P.R.N. ), Latin for "in the circumstances", prescription jargon PRN Forum , a precursor to the Journal of Pain and Symptom Management