End of a Drug Exposure
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End of a drug exposure
- Requester: Klaus Bonadt, Christian Reich, Patrick Ryan
- Discussion: here
Proposal
Relevant table: DRUG_EXPOSURE
| Field | Required | Type | Description |
|---|---|---|---|
| drug_exposure_end_date | Yes | date | The end date for the current instance of Drug utilization. Depending on different sources, it could be a known or an inferred date and denotes the last day at which the patient was still exposed to drug. |
| days_supply | No | integer | The number of days of supply of the medication as prescribed. This reflects the intention of the provider for the length of exposure. |
| verbatim_end_date | No | date | The known end date of a drug exposure as provided by the source. |
The verbatim_end_dat field is only necessary as the drug_exposure_end_date becomes mandatory, and might be (wrongly) inferred. In cases where no good data are available to fill that end_date, the ETL will have to take a guess, and that may not satisfy some algorithms for dose calculation.
Conventions
- The drug_exposure_end_date denotes the day the drug exposure ended for the patient. This could be that the duration of drug_supply was reached (in which case drug_exposure_end_date = drug_exposure_start_date + days_supply -1), or because the exposure was stopped (medication changed, medication discontinued, etc.)
Use Cases
All standardized analytics and the drug era constructor will only use the drug_exposure_end_date. The days supply could be used to understand the intent of prescribing versus the reality, and it could be used to calculate MPR.