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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).
Second, medical roots generally go together according to language, i.e., Greek prefixes occur with Greek suffixes and Latin prefixes with Latin suffixes. Although international scientific vocabulary is not stringent about segregating combining forms of different languages, it is advisable when coining new words not to mix different lingual roots.
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").
Meaning Δ: diagnosis; change: ΔΔ: differential diagnosis (the list of possible diagnoses, and the effort to narrow that list) +ve: positive (as in the result of a test) # fracture: #NOF: fracture to the neck of the femur ℞ (R with crossed tail) prescription: Ψ: psychiatry, psychosis: Σ: sigmoidoscopy: x/12: x number of months x/40: x ...
Meaning ā (a with a bar over it) before (from Latin ante) before: A: assessment a.a. of each (from Latin ana ana) amino acids: A or Ala – alanine; C or Cys – cysteine; D or Asp – aspartic acid; E or Glu – glutamic acid; F or Phe – phenylalanine; H or His – histidine; I or Ile – isoleucine; K or Lys – lysine; L or Leu ...
Meaning h: hr / hours H: histamine or its receptors (if with subscripts) hemagglutinin: H x: history: HA ; H/A hypertonia arterialis headache calcium hydroxyapatite HAA: hepatitis-associated antigen or #History As Above HAART: highly active antiretroviral therapy HACA: human anti-chimeric antibody: HACE: High-altitude cerebral edema: HACEK
Meaning s̅: without (s with an overbar) (from Latin sine) S: sacrum: S x: symptoms surgery (though deemed by some as inappropriate) S 1: first heart sound: S 2: second heart sound: S 3: third heart sound S 4: fourth heart sound S&O: salpingo-oophorectomy Sb: Scholar batch SAAG: serum–ascites albumin gradient SAB: staphylococcal bacteremia