- Two-letter prefixes, except when intentionally chosen to refer explicitly to a specific SDTM domain and its --DTC, --STDTC, and/or --ENDTC variables. For an example of an appropriate intentional use of a two-letter prefix, if * is LB, then *DT is LBDT, the numeric date version of SDTM variable LBDTC. For an example of the problem, if * is QQ, then a date *DT would be QQDT, which would potentially be confusing if the producer intended QQDT to be something other than the numeric date version of a potential SDTM variable QQDTC.
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