# How to add unit {index_val} from UCUM?

**Category:** [Archetype Designer](https://discourse.openehr.org/c/archetype-designer/30)
**Created:** 2023-01-09 14:44 UTC
**Views:** 638
**Replies:** 2
**URL:** https://discourse.openehr.org/t/how-to-add-unit-index-val-from-ucum/3440

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## Post #1 by @vanessap

Hi all!
I am using LOINC where one of the units is referred as using {index_val} but i can't find a way of adding it in ADL designer. 
Does anyone knows how to do it or does it have to be added to the property file?

eg: https://build.fhir.org/valueset-ucum-units.html

@siljelb @borut.fabjan

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## Post #2 by @siljelb

Hi! This unit '{index_val}' is basically the same as '1', as anything in curly braces is disregarded by a UCUM parser.

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## Post #3 by @vanessap

thank you!

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**Canonical:** https://discourse.openehr.org/t/how-to-add-unit-index-val-from-ucum/3440
**Original content:** https://discourse.openehr.org/t/how-to-add-unit-index-val-from-ucum/3440