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Re: [Gnumed-devel] More lab test result considerations: groupings

From: James Busser
Subject: Re: [Gnumed-devel] More lab test result considerations: groupings
Date: Tue, 26 Feb 2008 19:44:57 -0800

On 26-Feb-08, at 3:14 AM, Karsten Hilbert wrote:

On Sun, Feb 10, 2008 at 10:53:09AM -0800, James Busser wrote:

The lab results in BC CA include the HL7 message segment OBR 004
"Universal Service ID" of the form "Test code^Test name" for example

The thing to note is that a *single test code* can represent *multiple
results* that will be received.

I think we are misinterpreting the LOINC code.

Not me :-)

are simply other labels for "things". In a sense they are
like Esperanto. What we call Natrium and you call Sodium is
both LOINC-2951-2 such that we can know what each other
means w/o having to know that Sodium == Natrium in an
English to German sense.

LOINC entities are characterized by:


In your example above the record is
"2951-2" "Sodium" "SCnc" "Pt" "Ser/ Plas" "Qn" "NA;" "CHEM" "AF" "20041102" "MIN" 1 "NATRIUM," "Y" 0 "Y" "Na; Substance concentration; Level; Point in time; Random; SerPl; SerPlas; SerP; Serum; SR; Plasma; Pl; Plsm; Quantitative; QNT; Quant; Quan; Chemistry" "Sodium SerPl- sCnc" "BOTH" "Y"

So there seems to already be some support in LOINC to recognize the same "thing", represented by any one LOINC_NUM, by more than one "word" e.g. component "Sodium" (component) aka "NATRIUM" (ACSSYM)

see release_notes.html LOINC chemical name synonyms, alternative names and chemical formulae from the Chemical Abstract Society.

... there is also some work on internationalizing LOINC:

The LOINC code for an LYTEs OBR means just that: this is a
It does NOT mean: a LYTEs OBR includes Sodium and Potassium.

I did not misunderstand, and would in fact point out that there *is no* LOINC for an LYTES OBR, only a test code as defined by that particular lab, and having (usually) no reliable relationship to any identically-named test code by some other lab. The OBR refers to the test *codes* IOW the test *panel* as arbitrarily defined by the laboratories without any standardized naming (though multiple Canadian labs are starting to standardize, at least informally.) The LOINC is only for each of the individual results (one or multiple) that come from any test code / panels.

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