Using LOINC with SNOMED CT

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Examples

Example 1: Link between causative agent organism and tests for organisms

Description

A GP needs to confirm a diagnosis of Pulmonary Tuberculosis. To do so, launches a query in order to obtain all the related lab tests.

Conclusion

System retrieves all those clinical lab tests which component (towards) is related to the causative agent of the disease.
It is possible to refine the selection by considering the relationship between the disease finding site and the specimen source topography.

Example 2: Link between antibody in SNOMED CT and LOINC

Description

A GP needs to check vaccinations status level for rubella and queries the system for which lab tests are related.

Conclusion

System retrieves all those clinical lab tests which component (towards) is equivalent to the component of the evaluation procedure.

Example 3: Link between substance in SNOMED CT and measurement in LOINC

Description

A GP needs to confirm a diagnosis of Hemochromatosis. To do so, launches a query in order to obtain related lab tests.

Conclusion 

System retrieves all those clinical lab tests which component (towards) is related to the causative agent of the disease.

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Figure 5.2.7-5: RUP HFE decision algorithm

Example 4: LOINC and SNOMED CT in the Interface Between Laboratory Data and EHR

Table 5.2.7-1: Illustrations of Implementation of LOINC and SNOMED CT in the Interface Between Laboratory Data and EHR

Diagram of Simplified Information ModelDescription

This diagram illustrates a general case of a laboratory test on two specimens (coded with SNOMED CT) and test profiles containing four tests (coded using LOINC) two of which are applied to each of these specimens.

This diagram illustrates an anatomical pathology test for a specimen (e.g. a biopsy) taken from a particular site. Both the specimen type and site are coded using SNOMED CT. In this case the test is coded using LOINC and the diagnosis arising from the interpretation of the test result is coded using SNOMED CT.
Although not shown in this illustration, specific pathological findings leading to the diagnosis could also be coded using SNOMED CT.

This diagram outlines a recommended approach to representing a structured microbiology report using SNOMED CT and LOINC for different elements.

This diagram illustrates relationships between EHR entries coded using SNOMED CT and a microbiology report coded using the mixture of LOINC and SNOMED shown above.
In one case the link between organisms is simple, since both elements are coded using SNOMED CT. In the other the use of LOINC to represent a sensitivity test has an indirect link to a pharmaceutical product which contains that antibiotic. The latter in this case is represented using SNOMED CT.

Note: The diagrams in this table are based on illustrations used in presentation by Hong Kong Hospital Authority (HKHA) as part of their work on matching their requirements to a combination of SNOMED CT and LOINC coding.

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