# How is a NAPP record uniquely identified?

**URL:** <https://forum.ipums.org/t/how-is-a-napp-record-uniquely-identified/179>\
**Category:** INTERNATIONAL\
**Created:** [January 13, 2013, 6:31am UTC](https://forum.ipums.org/t/how-is-a-napp-record-uniquely-identified/179 "2013-01-13T06:31:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![IPUMS](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/ipums/32/41_2.png) [@IPUMS](https://forum.ipums.org/u/IPUMS)\
**Post date:** [January 13, 2013, 6:31am UTC](https://forum.ipums.org/t/how-is-a-napp-record-uniquely-identified/179/1 "2013-01-13T06:31:00Z")

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How is a NAPP record uniquely identified?

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<div class="post-metadata">

**Author:** ![IPUMS](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/ipums/32/41_2.png) [@IPUMS](https://forum.ipums.org/u/IPUMS)\
**Post date:** [January 22, 2013, 3:22pm UTC](https://forum.ipums.org/t/how-is-a-napp-record-uniquely-identified/179/2 "2013-01-22T15:22:00Z")

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Three variables constitute a unique identifier for each record in the NAPP: SAMPLE, SERIAL, and PERNUM (sample, household index number, and person index within household). SERIAL is a unique household identifier.