# Potassium serum or plasma

**URL:** https://forum.loinc.org/t/potassium-serum-or-plasma/1079
**Category:** chemistry
**Created:** [November 22, 2020, 7:04pm UTC](https://forum.loinc.org/t/potassium-serum-or-plasma/1079 "2020-11-22T19:04:42Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![beanformer](https://forum.loinc.org/letter_avatar_proxy/v4/letter/b/a5b964/32.png) [@beanformer](https://forum.loinc.org/u/beanformer)
#### Post date: [November 22, 2020, 7:04pm UTC](https://forum.loinc.org/t/potassium-serum-or-plasma/1079/1 "2020-11-22T19:04:42Z")

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Hello,

I wonder how LOINC can be used to store potassium determinations from serum and plasma separately and uniquely identifiable. Apparently there is only one LOINC code for serum and plasma together. Both source materials are very different and therefore have different reference values.

&nbsp;

Thanks,

Matthias

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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: [November 23, 2020, 9:28am UTC](https://forum.loinc.org/t/potassium-serum-or-plasma/1079/2 "2020-11-23T09:28:53Z")

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Hello Matthias,

Please see page 40 of the LOINC User’s Guide for a detailed explanation of the early LOINC development guidelines involving serum or plasma systems. We hope you will provide a few examples of analytes referred in your email, so the conversation can continue.

Best regards,

Pam Banning

Lab LOINC committee co-chair

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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/potassium-serum-or-plasma/1079/3 "2023-06-23T15:36:46Z")

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