What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 12812-4: Potassium spec 2 [Moles/Vol]

Name: LOINC Code 12812-4: Potassium spec 2 [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:23.605Z

12812-4 is a LOINC code used to identify Potassium spec 2 [Moles/Vol] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Potassium^2nd specimen. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Potassium^2nd specimen. It is commonly used with the system or sample type Ser/Plas.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Observation

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Potassium [Moles/volume] in Serum or Plasma --2nd specimen
Potassium^2nd specimen
Chemistry; Convalescent; k; K+; Level; Pl; Plasma; Plsm; Point in time; Post immunization; Potass; QNT; Quan; Quant; Quantitative; Random; Second; SerP; SerPl; SerPlas; Serum; Serum or plasma; sp2; Spec; SR; Substance concentration

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Potassium spec 2 [Moles/Vol]Potassium [Moles/volume] in Serum or Plasma --2nd specimenPotassium sp2 SerPl-sCncPotassium^2nd specimenCHEMPotassium specimen 2, BloodSCnc

Frequently asked questions

Code details

Code12812-4

SystemLOINC

Display namePotassium spec 2 [Moles/Vol]

DescriptionPotassium^2nd specimen

Short namePotassium sp2 SerPl-sCnc

ComponentPotassium^2nd specimen

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsmmol/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.40

Consumer names

Potassium specimen 2, Blood

Part names

Potassium^2nd specimenSCncPtSer/PlasQnSubstance ConcentrationPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.