documentation:next_cdm:days_supply
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documentation:next_cdm:days_supply [2016/01/11 16:40] klaus_bonadt |
documentation:next_cdm:days_supply [2016/11/01 17:40] vojtechhuser |
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| - | ===== Remove days_supply field ===== | + | ===== End of a drug exposure ===== |
| - | * Requester: Klaus Bonadt | + | * Requester: Klaus Bonadt, Christian Reich, Patrick Ryan |
| * Discussion: [[http://forums.ohdsi.org/t/proposal-for-conventions-regarding-quantity-and-strength/1036|here]]. | * Discussion: [[http://forums.ohdsi.org/t/proposal-for-conventions-regarding-quantity-and-strength/1036|here]]. | ||
| ---- | ---- | ||
| ==== Proposal ==== | ==== Proposal ==== | ||
| - | Since the days_supply and the drug_exposure_end_date fields essentially denominate the same thing. In addition, having two fields generates the possibility of inconsistency. | + | Relevant table: http://www.ohdsi.org/web/wiki/doku.php?id=documentation:cdm:drug_exposure |
| + | |||
| + | 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: | ||
| + | |||
| + | ^Field^Required^Type^Description^ | ||
| + | |drug_exposure_end_date|Yes or No|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.| | ||
| + | |||
| + | The verbatim_end_dat field is only necessary if we decide to make the drug_exposure_end_date mandatory. In cases where no good data are available to fill that end_date, teh 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 === | === Use Cases === | ||
| - | None, since this is a removal. | + | 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 [[http://www.pharmacytimes.com/contributor/michael-crowe-pharmd-mba-csp-fmpa/2015/07/do-you-know-the-difference-between-these-adherence-measures|MPR]]. |
documentation/next_cdm/days_supply.txt · Last modified: 2017/07/06 19:18 by clairblacketer
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