Comma usage

Dr Henry Knipe and Dr Mark Thurston et al.

The serial, series, Oxford, or Harvard comma is the addition of a comma placed immediately before the coordinating conjunction (usually and or or). In Radiopaedia, this should be used when composing lists within body text, to aid consistency of style and reduce ambiguity.


  • CT, MRI, or plain radiograph not CT, MRI or plain radiograph.
Help and Style Guide

Article information

rID: 53579
Synonyms or Alternate Spellings:
  • Oxford comma
  • series comma
  • serial comma
  • Harvard comma

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