LOINCActiveObservation

LOINC Code 13455-1: Lithium.plasma/Lithium.RBC (Bld) [Mass ratio]

13455-1 is a LOINC code used to identify Lithium.plasma/Lithium.RBC (Bld) [Mass ratio] 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 Lithium.plasma/Lithium.RBC. It is commonly used with the system or sample type Bld.

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 Lithium.plasma/Lithium.RBC. It is commonly used with the system or sample type Bld.

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

Lithium.plasma/Lithium.RBC [Mass Ratio] in Blood
Lithium.plasma/Lithium.RBC
Blood; DRUG/TOXICOLOGY; Drugs; Eskalith; Li; Lithane; Lithium SerPl; Lithium SerPlRBC; Mass concentration ratio; Mass ratio; MCRto; Point in time; QNT; Quan; Quant; Quantitative; Random; WB; Whole blood

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

Lithium.plasma/Lithium.RBC (Bld) [Mass ratio]Lithium.plasma/Lithium.RBC [Mass Ratio] in BloodLithium SerPl/RBC BldLithium.plasma/Lithium.RBCDRUG/TOXLithium.plasma/Red Blood Cell Lithium, BloodMRto

Frequently asked questions

Code details

Code13455-1
SystemLOINC
Display nameLithium.plasma/Lithium.RBC (Bld) [Mass ratio]
DescriptionLithium.plasma/Lithium.RBC
Short nameLithium SerPl/RBC Bld
ComponentLithium.plasma/Lithium.RBC
PropertyMRto
TimingPt
System (specimen)Bld
ScaleQn
ClassDRUG/TOX
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.42

Consumer names

Lithium.plasma/Red Blood Cell Lithium, Blood

Part names

Lithium.plasma/Lithium.RBCMRtoPtBldQnMass RatioPoint in time (spot)Blood

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.

LOINC Code 13455-1 | HealthAssure