-----Original Message----- From: Sam Heard [mailto:sam.he...@bigpond.com] Sent: Friday, 24 October 2003 11:00 AM To: Tim Churches Subject: RE: Re: Pathology requirements TEXTURAL RESULTS TO QUANTITIES
Tim As we seek to achieve automatic processing of some of the data in the EHR there will be clear efficiencies in changing some conventions. For instance, RBC/HPF = 0 is very easy to understand. They are not usually 'seen' anyway any more so why pretend. What I was getting at is when a numeric response is there - but wrong - and a textural entry replaces the quantity - as in 'haemolysed'. I am proposing that the archetype node to do this is not the same as the quantity - so it would replace it. It would then not come back in queries looking for K+ levels. Tom and I have thought about ranges as fuzzy quantities e.g. >100 or <0.5 - these are possible in all analytes in practice but rarely met. Thanks, Sam > -----Original Message----- > From: owner-openehr-technical at openehr.org > [mailto:owner-openehr-technical at openehr.org]On Behalf Of Tim Churches > Sent: Thursday, 23 October 2003 4:55 PM > To: Tim Churches > Cc: Sam Heard; Openehr-Technical > Subject: Re: Re: Pathology requirements TEXTURAL RESULTS TO QUANTITIES > > > Tim Churches <tchur at optushome.com.au> wrote: > > > > Sam Heard <sam.heard at bigpond.com> wrote: > > > > > > TEXTURAL RESULTS TO QUANTITIES > > > > ?TEXTUAL? > > > > This raises the general issue of how mixed categorical/ordinal/scalar > > quantities > > are handled eg (made up example) haematuria: Trace->x RBC/ml -> Gross > > > > haematuria. > > Sorry, brain-fade. I meant x RBC/HPF (per high power field) or > similar. This is an > example of a sampled result i.e. a random sample of portions of a > "specimen" > are examined and a mean is reported. The mean is quantitative, > but is just a > point estimate of the central tendency of an underlying > probability density > function. Thus it may have a std dev or confidence intervals > associated with it. > Also, in this circumstance zero doesn't really mean zero and is > generally not > reported as such: if no RBC were seen in any HPF, then it will be > reported > as "No RBC seen", not as "mean RBC/HPF = 0". Generalising this, scalars > which parameterise a probability distribution are different from > scalars which are > precise quantities - or are they? Hmmm. > > Tim C > > > > Conceivably some use might be made of the numbers, as > > opposed > > to the ordinal categorical extrema? > > > > Tim C > > - > > If you have any questions about using this list, > > please send a message to d.lloyd at openehr.org > > - > If you have any questions about using this list, > please send a message to d.lloyd at openehr.org - If you have any questions about using this list, please send a message to d.lloyd at openehr.org
