# Filtering notifications with AWS HealthLake
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Refine your notifications using standard FHIR search parameters in your `Subscription` criteria.

**Supported filters**

The following table shows a list of supported filter criteria that HealthLake supports for Subscriptions.


| Search parameter types | FHIR data type | Modifiers | Supported prefixes | 
| --- | --- | --- | --- | 
| String | string<br />HumanName<br />Address | exact, contains missing |  | 
| Token | boolean<br />code<br />string<br />Coding<br />CodeableConcept<br />Identifier<br />ContactPoint<br />id | not, text, missing |  | 
| Number | integer<br />decimal<br />positiveInt<br />unsignedInt | missing | "eq", "ne", "gt", "lt", "ge", "le", "sa", "eb", "ap" | 
| Date | date<br />dateTime<br />instant<br />Period<br />Timing |  | "eq", "ne", "gt", "lt", "ge", "le", "sa", "eb", "ap" | 
| Quantity | Quantity<br />Money<br />Range<br />SimpleQuantity |  | "eq", "ne", "gt", "lt", "ge", "le", "sa", "eb", "ap" | 
| Reference | Reference | missing, identifier, type |  | 
| URI | uri<br />url<br />canonical<br />uid<br />oid | missing |  | 

**Sample supported filters**

The following table shows samples of supported filter criteria that HealthLake supports for Subscriptions:


| Purpose | Filter criteria | Description | 
| --- | --- | --- | 
| Patient-specific observations | Observation?patient=Patient/[id]&status=final | Get notifications when observations for a specific patient are finalized | 
| Patient-specific observations | Patient?birthdate=gt2021 | Get notifications when patients born after 2021 are registered or updated | 
| Patient-specific observations | Condition?code=http://snomed.info/sct\|39065001 | Get notifications for conditions with specific SNOMED codes | 
| Patient-specific observations | Observation?code=http://loinc.org\|8480-6&value-quantity=gt160 | Get notifications for high systolic blood pressure readings |