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• Multiple-choice values indicated as a WARNING might actually be valid.
  • More details: The Cancer Reporting IG defines several codes as multiple-choice. Meaning that a single value in a cancer report can come from multiple (usually 3) different code systems or value sets. Many times, two of the code systems/value sets will be bound to SHOULD and the third will be bound to MAY. The test data supplies a code from each code system and/or value set. For example, see "value (Histologic Type)" in the test data and conformance rule 1098-19207 in the IG and Schematron. Any of the provided values are valid. During context-free validation, only the code system/value set choices bound as SHOULD are checked. This means that if a value comes from one of the SHOULD code systems/value sets, then the conformance statement will pass. However, if the value does not come from a code system/value set bound to SHOULD, and even if it does come from a code system/value set bound to MAY, then a warning will be thrown. This warning must checked by the tester.

• Local values indicated as a WARNING might actually be valid.
  • More details: Some values are defined as: SHOULD be from LOINC, otherwise they SHALL be from a code system local to the sending EHR. For example, see conformance rule 1098-7133 in the IG and Schematron. Similarly to the above, if the value is not from LOINC then a warning is thrown and the tester must check it that the value does indeed come from a local code system.

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