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  1. The subject characteristics that should be collected are not specified by CDASH; this is a medical and scientific decision that should be based on the needs of the protocol.
  2. The SDTMIG variable SCDTC can be determined from a collected date of the visit (VISDAT); in such cases, a CDASH date of collection field is not required on the CRF
  3. This domain is used to represent the results/findings of a respiratory diagnostic procedure (e.g., spirometry).
  4. Many respiratory assessments require the use of a device. When data about the device used for an assessment or additional information about its use in the assessment are collected, SPDEVID should be included in the record. 
  5. Any identifier variables, timing variables, or Findings general observation class qualifiers may be added to the RE domain, but the following qualifiers would generally not be used in the RE domain: --MODIFY, --BODSYS, and --FAST.