documentation:next_cdm:denominator_units
This is an old revision of the document!
Denominator Units for liquid drugs and quantity field in DRUG_EXPOSURE
- Requester: Klaus Bonadt
- Discussion: here.
Proposal
Proposal for conventions to achieve consistent entries in the attribute quantity of the DRUG_EXPOSURE table and entries in the DRUG_STRENGTH table. Eventually, we will be able to calculate the total amount of the active ingredient by
- DRUG_EXPOSURE.quantity x DRUG_STRENGTH.nominator_value (for concentrations) or
- DRUG_EXPOSURE.quantity x DRUG_STRENGTH.amount_value (for tablets)
Conventions for the DRUG_STRENGTH table:
- The denominator units should fit to the “sales unit”. Examples:
- For solid forms the denominator unit is empty (it conceptually represents “Tablets or pieces”) and the ingredient is provided in amount_value and amount_unit_concept_id.
- For liquids the denominator unit typically is mL and the concentration is provided in the numerator and denominator attributes.
- For Gels both mL and mg are possible candidates. Chose that unit which will be used to describe the total amount of the product.
- For products with a dosage release rate (for example patches), use hour as a denominator.
- Multi-Substance products are represented by multiple entries with the same drug_concept_id. All entries should refer to the same denominator.
Conventions for the quantity attribute in the DRUG_EXPSOSURE table.
- The value for quantity represents the quantity of the drug in the denominator unit of the corresponding entry (or entries) in the DRUG_STRENGTH table.
- For products with a dosage release rate (for example patches), the quantity refers to the number of pieces.
Use Cases
Find use cases here
documentation/next_cdm/denominator_units.1450456294.txt.gz · Last modified: by klaus_bonadt