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Variables to support datapoint traceability should be included whenever practical and feasible. Primary candidates for datapoint traceability, when used in conjunction with USUBJID, include the dataset or domain name, the name of the source variable, and the relevant sequence number (SDTM domain -‑SEQ value or the ADaM ASEQ value). The ADaM ASEQ variable (see Section 2.9.6.1 ,Identifier Variables for BDS Datasets) facilitates datapoint traceability by providing sequence numbers that are unique within a subject within an ADaM dataset, ensuring uniqueness of a record when used in combination with USUBJID.

The following table below defines additional variables useful in certain situations to facilitate datapoint traceability. These variables are useful in situations where a single ADaM dataset or multiple SDTM datasets and/or ADaM datasets were used to create an ADaM dataset. Section 2.9.9.3, Inclusion of Input Data that Are Not Analyzed but that Support a Derivation in the ADaM Dataset, contains an example of how to use these variables.

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If the value of AVAL or AVALC in the ADaM dataset is taken from another ADaM dataset, SRCDOM, SRCVAR, and SRCSEQ will contain the name of the source ADaM dataset, the variable name, and the ASEQ value of the row where the source datapoint is located, respectively. If the source SDTM dataset is a supplemental qualifier dataset, the two2-letter domain prefix of --SEQ in the ADaM dataset will be the related domain abbreviation (the value of RDOMAIN in SUPP-- or SUPPQUAL), and SRCVAR will contain the value of QNAM.

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