has changed since last episode

has changed since last episode is used to compare the latest sample with the second-last sample, whether or not these samples are blank.

We can also use the expression has not changed since last episode.

For example, given the following case fragment,

           01 Jun 03    20 Jun 03    30 Jun 03    15 Oct 03    02 Nov 03
ReqDr         Jones        Jones        Jones        JONES        Jones
CopyDr                     Smith        Smith        Brown        Smith
Tests         Lipids       Lipids                    Lipids       
Insurance     DVA          DVA          DVA

ReqDr has not changed since last episode

CopyDr has changed since last episode

Tests has changed since last episode

Insurance has not changed since last episode