2013 08 - LOINC Advanced Mapping Topics

7/27/2019 2013 08 - LOINC Advanced Mapping Topics

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[email protected]

Advanced Mapping Topics
mailto:[email protected]:[email protected]


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Brief Summary Drawn From

LOINC Users Guideloinc.org/downloads

LOINC Mappers Guide to the Top 2000+Lab Observationsloinc.org/usage/obs
http://loinc.org/usage/obshttp://loinc.org/usage/obshttp://loinc.org/usage/obshttp://loinc.org/downloadshttp://loinc.org/downloads


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Prid/Nom versus Type/Nom

Presence or Identity / Nominal

Expected result comes from a list

Coded or free textSNOMED recommended

No growth

Type / Nominal

As above, but no negative


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ACnc/OrdArbitrary concentration / Ordinal

Expected results

Positive, Negative

Detected, Not detected

Yes, No

Note: ACnc is the old style that is being replaced

for some observations with ordinal values


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photo via sveinhal
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ACnc

Number of arbitrary units in a volume.

Temporary placeholder for ordinalanswers that is gradually being replaced byThreshold and Presence.

McDonald, C., S. Huff, J. Deckard, K. Mercer, J. Phillips, and D. Vreeman, eds. 2013. Logical Observation Identifiers, Names, and Codes (LOINC) Users Guide.http://loinc.org/downloads.
http://loinc.org/downloadshttp://loinc.org/downloadshttp://loinc.org/downloads


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ThresholdFor observations reported as pos/neg (ordetected/not detected) based on aninternal threshold or cut off.

Mostly toxicology, chemistry, and antigen/antibody tests.

McDonald, C., S. Huff, J. Deckard, K. Mercer, J. Phillips, and D. Vreeman, eds. 2013. Logical Observation Identifiers, Names, and Codes (LOINC) Users Guide.http://loinc.org/downloads.
http://loinc.org/downloadshttp://loinc.org/downloadshttp://loinc.org/downloads


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SystemXXXmeans unknown, unspecified in the testname, and/or specified in another part of the message.

Specified SystemSer

Urine

Wound

Cvx

Stool

Isolate

Etc.


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MethodNucleic acid target amplification and probe(prob.amp.tar)

Polymerase Chain Reaction

Transcription Mediated Amplification

Ligase Chain Reaction

Nucleic acid signal amplification and probe

(prob.amp.sig)

Hybridization Protection Assay

Branched Chain DNA


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13/36photo via William Brawley
http://www.flickr.com/photos/williambrawley/4867472163http://www.flickr.com/photos/williambrawley/4867472163http://www.flickr.com/photos/williambrawley/4867472163http://www.flickr.com/photos/williambrawley/4867472163


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Allergen Reporting

Three possible ways1. Numeric concentration of IgE antibodies (IU/mL)

2. A Rank (the RAST class from 1-6) based on theconcentration

3. A Percent of the reaction rate to the control specimen


15/36photo via Pulmonary Pathology
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HIV-related Testing

CD3 marker needed to accuratelyidentify T-cells

CD3+ CD4+Both needed to identify T4 helper cellsOften called CD4+ marker, T4 cells, etc

CD3+ CD8+

Same rules apply as above.


17/36photo via Wikimedia Commons
http://en.wikipedia.org/wiki/File:Periodic_table.svghttp://en.wikipedia.org/wiki/File:Periodic_table.svghttp://en.wikipedia.org/wiki/File:Periodic_table.svg


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Cholesterol LDLCalculated

Included in routine lipid panels, estimated from this equation:

Direct

If reported alone, this is the most likely one.

Method unspecified (if you dont know)


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Analytes in Urine

Possible ways1. Spot (random). Have Pt as Time and a concentration as

Property (MCnc, SCnc, etc)

2. Timed (24H) concentration. (multiply measured byvolume of full collection)

3. Excretion rate (24H).


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Choriogonadotropin

Pregnancy Tests

Tumor Marker


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Toxicology

Codes specific to many specimens

Different codes for screening andconfirmatory tests

Watch out for singular vs plural


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Naming Conventions

Many local names just include thedisorder, so need to know what isactually being tested for: specific

genes, mutations, etc.


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Routine Cultures

ComponentBacteria identified

Fungus identified

Virus identified

Method

CultureAnaerobic culture

Aerobic culture


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Bacteria identified

Anything that will grow on routineculture media

Bacteria

Yeasts (sometimes)

Does not mean only positive resultsNo growth

Normal flora

No significant growth


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Susceptibility Testing

Antibiotics, etc

LOINC has codes based on methods

Methodless

Minimum Inhibitory Concentrations

Kirby Bauer disc testing

Gradient strip (E-test)


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Susceptibility Testing

Resistance Genes in Bacteria


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photo via AlishaV
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Point Of Care (POC)

After discussion LOINC Committeedecided NOT to distinguish on thisaspect in the LOINC name.

Many times the POC variant has a

System of Bld (versus Ser, etc).

2013 08 - LOINC Advanced Mapping Topics

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