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Definition: Dyfais sy'n cynnal pedwar dadansoddiad gwahanol ar un sampl, ee pedwar dadansoddiad gwahanol am yr un haint, neu ddadansoddiadau ar gyfer pedwar haint gwahanol.
Notes: Mae'r ffurf Saesneg "4-in-1 test" yn gyfystyr ac mewn cyd-destunau llai technegol mae'n bosibl y byddai "prawf 4 mewn 1" yn fwy dealladwy i'r gynulleidfa.
