LOINC long common name : PhenX - substance - 30D frequency protocol 031301;
LOINC short name : Substance - 30D frequency proto;
LOINC description : Measurement of respondent's 30-day frequency of use of drugs. Respondents are asked
the 30-day frequency question only if they answered yes to a drug in the Substances
- Lifetime Use measure. For example, if a respondent said he or she had ever used
marijuana, he or she will be asked the 30-day question for marijuana. If the respondent
answered no to ever using cocaine, the 30-day question for cocaine is skipped. The
source survey asked these questions of respondents aged 12 years and older. However,
the PhenX Working Group recommends that these be asked only after the screener question,
which is asked only of respondents aged 18 years and older.;