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Remove days_supply field

  • Requester: Klaus Bonadt, Christian Reich, Patrick Ryan
  • Discussion: here.


If the days_supply and the drug_exposure_end_date fields essentially designate the same thing they are therefore duplicates of the same information and create the danger of of inconsistency. One of them could be dropped.

Alternatively, we could split them into two different meanings:

drug_exposure_end_dateYesdateThe end date for the current instance of Drug utilization. Depending on different sources, but it denotes the date at which the patient no longer was exposed to drug.
days_supplyNointegerThe number of days of supply of the medication as prescribed. This reflects the intention of the provider for the length of exposure.
  • 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), 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.

documentation/next_cdm/days_supply.1456402228.txt.gz · Last modified: 2016/02/25 12:10 by cgreich