Common mathematical signs, symbols, statistical and medical terms
Table: mathematical signs and symbols
|×||multiplied by (‘times’)|
|≠||not equal to|
|>||greater than (ie >500 means ‘more than 500’)|
|≥||greater than or equal to (ie ≥500 means ‘500 and over’)|
|≤||less than or equal to|
|±||plus or minus – this is use to show the range of group of values (Standard Deviation) when the mean is used to calculate the average, eg SD ± 0.45.|
|n||number (in a statistical sample, eg n=16 means 16 results, people etc)|
Table: Greek characters
|α||alpha or alfa||a|
|Δ δ||delta||d – this is the abbreviation for ‘change|
|μ||mu||m – this is the abbreviation for ‘micro’ eg µL = micro litre|
Greek letter are commonly used for names of immune-related chemicals, ie interferon-alpha (IFN-a, IFN-α) or interferon-beta (INF-b, IFN-β) to treat hepatitis C.
Delta is used as a short cut for ‘change’, ie delta CD4 (ΔCD4 or δCD4) means ‘change in CD4’.
Table: medical abbreviations
|qd or QD||once daily|
|bd or BD or BID||twice daily|
|td or TD or TID||three times daily|
|q12h or q12H||every 12 hours|
|q24h or q24H||every 24 hours|
|Px||problem, symptom (P = patient)|
|Rx||prescription or resistance|
Last updated: 22 July 2009.