# Where to find a list of all properties? (missing from User Guide)

**URL:** <https://forum.loinc.org/t/where-to-find-a-list-of-all-properties-missing-from-user-guide/1018>\
**Category:** general-discussion\
**Created:** [March 13, 2019, 9:45am UTC](https://forum.loinc.org/t/where-to-find-a-list-of-all-properties-missing-from-user-guide/1018 "2019-03-13T09:45:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![smaisidoro](https://forum.loinc.org/user_avatar/forum.loinc.org/smaisidoro/32/39_2.png) [@smaisidoro](https://forum.loinc.org/u/smaisidoro)\
**Post date:** [March 13, 2019, 9:45am UTC](https://forum.loinc.org/t/where-to-find-a-list-of-all-properties-missing-from-user-guide/1018/1 "2019-03-13T09:45:37Z")

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I stumbled upon a LOINC code that has the property “Rden”

[https://r.details.loinc.org/LOINC/5811-5.html?sections=Comprehensive](https://r.details.loinc.org/LOINC/5811-5.html?sections=Comprehensive)

However I can’t find any documentation of this property in the User Manual, or Ontologies.

Is there any place I can find a more complete reference than the User manual?

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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:** [March 13, 2019, 10:35am UTC](https://forum.loinc.org/t/where-to-find-a-list-of-all-properties-missing-from-user-guide/1018/2 "2019-03-13T10:35:13Z")

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Hello Sergio,

All of the properties were modeled after measurements from the International Union of Pure and Applied Chemistry (IUPAC) color book series. I believe the Silver Book was the primary source originally. RDen or Relative Density is defined in a Google search of ‘Relative Density IUPAC Book’ as "Ratio of density to a reference density, usually the density of water at 4 degrees C; in the older literature this is called specific gravity. The electronic search returned from the IUPAC Gold Book. The IUPAC has their own organizational website.

I also went into RELMA and searched Property:RDen, found all related terms and chose one to see comprehensive detail. The definition in RELMA has additional information for your benefit. I presume you already have read within the LOINC User’s Guide, Table 8 - Example LOINC properties, Chapter 4 and Appendix E.

Thank you for the question; I hope this helps!

Pam Banning

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**Author:** ![smaisidoro](https://forum.loinc.org/user_avatar/forum.loinc.org/smaisidoro/32/39_2.png) [@smaisidoro](https://forum.loinc.org/u/smaisidoro)\
**Post date:** [March 13, 2019, 10:52am UTC](https://forum.loinc.org/t/where-to-find-a-list-of-all-properties-missing-from-user-guide/1018/3 "2019-03-13T10:52:48Z")

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Thank you, yes this was quite helpful!

Now I know in the future where to search for this information. And yes I’ve been using the Table 8: Example LOINC Properties as my main reference which has worked 99% of the time to answer my questions and further search. I apparently just failed to see the footnote referring to the IUPAC silver book.

Best regards

Sergio

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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/where-to-find-a-list-of-all-properties-missing-from-user-guide/1018/4 "2023-06-23T15:36:42Z")

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