# relationship between LOINC parts (LP) and groups (LG)

**URL:** <https://forum.loinc.org/t/relationship-between-loinc-parts-lp-and-groups-lg/1013>\
**Category:** loinc-groups\
**Created:** [February 14, 2019, 4:22pm UTC](https://forum.loinc.org/t/relationship-between-loinc-parts-lp-and-groups-lg/1013 "2019-02-14T16:22:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![thomashc](https://forum.loinc.org/letter_avatar_proxy/v4/letter/t/ee7513/32.png) [@thomashc](https://forum.loinc.org/u/thomashc)\
**Post date:** [February 14, 2019, 4:22pm UTC](https://forum.loinc.org/t/relationship-between-loinc-parts-lp-and-groups-lg/1013/1 "2019-02-14T16:22:55Z")

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Hi LOINCers,

Researchers at UCLA (and many other facilities) use the i2b2 Query & Analysis Tool (on de-identified EMR databases) where the terms are organized by LP- codes, presumably LOINC parts. We are looking into utilizing LOINC groups to make it easier to find the items of interest. I couldn’t find the information about LP codes on the web.

1. Would you know what is the source of these LP- codes and what is their relationship, if any, to LOINC groups?

2. What is the process by which the LP- and LG- codes are defined and generated? Are most of the lab result LG- codes algorithmically generated? E.g. a rule exists to group together an analyte level “in blood” and “in serum or plasma”. I assume that any logical collection of LOINCs that has utility as a set can be officially defined as a Group and that these can be defined ad-hoc as the needs arise.

Any insight will be greatly appreciated! We’re making a lot of assumptions at the moment.

-Thomas Chong, UCLA Health

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**Author:** ![thomashc](https://forum.loinc.org/letter_avatar_proxy/v4/letter/t/ee7513/32.png) [@thomashc](https://forum.loinc.org/u/thomashc)\
**Post date:** [February 23, 2019, 10:31pm UTC](https://forum.loinc.org/t/relationship-between-loinc-parts-lp-and-groups-lg/1013/2 "2019-02-23T22:31:34Z")

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I found most of the information I needed in the LOINC User Guide and [https://open.med.harvard.edu/wiki/display/SHRINE/Ontology](https://open.med.harvard.edu/wiki/display/SHRINE/Ontology) for the ontology in I2B2.

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**Author:** ![pdbanning](https://forum.loinc.org/letter_avatar_proxy/v4/letter/p/9f8e36/32.png) [@pdbanning](https://forum.loinc.org/u/pdbanning)\
**Post date:** [June 2, 2019, 10:20am UTC](https://forum.loinc.org/t/relationship-between-loinc-parts-lp-and-groups-lg/1013/3 "2019-06-02T10:20:15Z")

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Hello Thomas!

We would be interested in your research group’s progress, and learn of any barriers you encountered /how they were overcome.

Thanks in advance,

Pam Banning

co-chair Lab LOINC committee

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**Author:** ![system](https://forum.loinc.org/uploads/default/original/1X/dbab97ce9b2987d788a376e254fcaae249f3b672.png) [@system](https://forum.loinc.org/u/system)\
**Post date:** [June 23, 2023, 3:36pm UTC](https://forum.loinc.org/t/relationship-between-loinc-parts-lp-and-groups-lg/1013/4 "2023-06-23T15:36:42Z")

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