Description
Check and preserve one of the five FHIR R5 quantity-comparator tokens.
Health-information systems separate identifiers, code-system namespaces, source versions, missing-value states and reference syntax. Recording a mapping or recognizing a restricted token does not validate its clinical meaning or a complete HL7/FHIR resource. Explicit null, empty text, unknown status and numeric zero are different states.
Check and preserve one of the five FHIR R5 quantity-comparator tokens.
When to use this tool
Use FHIR Quantity Comparator Token when checking the stated restricted health-data record, token or transition convention.
How to use the tool and how it works
- Enter comparator. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read token. Use the output convention below.
Accept exactly the comparator token <, <=, >=, > or ad and return it unchanged.1
The ad code means an amount sufficient to reach a stated total; it is distinct from the four relational comparison codes.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| comparator | Exactly <, <=, >=, > or ad, case-sensitive; no quantity, units or full resource are validated. | Required. Text; one of "<", "<=", ">=", ">", "ad"; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| token | JSON-encoded ordered tuple or literal token under the convention above; not a database lookup or authentication result. | Required. Text; maximum UTF-16 length 8192. |
{
"input": {
"comparator": "\u003c"
},
"output": {
"token": "\u003c"
}
}Limitations and assumptions
- This validates one comparator token only; no Quantity value, unit, coding context or full FHIR resource is evaluated.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Alternative or Complementary methods
Use the intended complete interoperability specification, authoritative terminology and verified source records for actual resource validation, semantic mapping or clinical use.
References
-
Calculation and input contract: health-informatics/fhir-quantity-comparator-token — tool.io
-
FHIR R5: QuantityComparator code system — HL7 International
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