# Using FHIR REST API interactions
<a name="nlp-rest-api"></a>

By default, traits detected by the Amazon Comprehend Medical API operations are not returned when making a `GET` request. To see the results of the integrated NLP operations, you must specify a known `ID` for the following FHIR resource types.
+ `Linkage`
+ `Observation`
+ `Condition`
+ `MedicationStatement`

The results of HealthLake integrated NLP actions outside the `DocumentReference` resource type are available using a `GET` request where the specified `ID` is know to contain results from the Amazon Comprehend Medical API operations.