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.

LOINCActiveBoth

LOINC Code 77349-9: Everolimus trough LC/MS/MS (Bld) [Mass/Vol]

Name: LOINC Code 77349-9: Everolimus trough LC/MS/MS (Bld) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:57.647Z

77349-9 is a LOINC code used to identify Everolimus trough LC/MS/MS (Bld) [Mass/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 Everolimus^trough. 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 Everolimus^trough. 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: Both
Method: LC/MS/MS

What it does not mean

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

Key facts

Everolimus [Mass/volume] in Blood by LC/MS/MS --trough

Everolimus^trough

Trough blood levels of everolimus is performed for therapeutic monitoring and dose individualization. Koster et. al. (2009) reported a systematic deviation in blood levels of everolimus (30% lower) measured by LC-MS/MS compared with immunoassays.[PMID19065123] Everolimus may be used to treat patients post transplant (e.g, kidney transplant) or with tuberous sclerosis complex (TSC) who have subependymal giant cell astrocytoma (SEGA). Maintaining everolimus troughs between 3-8 ng/mL is recommended for patients post transplant. Maintaining trough levels of 5 to 15 ng/mL is recommended in pediatric and adult patients with SEGA.

Afinitor; Blood; Certican; DRUG/TOXICOLOGY; Drugs; Level; Mass concentration; Point in time; Pre; Predose; Pre-dose; QNT; Quan; Quant; Quantitative; RAD-001; Random; WB; Whole blood; Zortress

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

Everolimus trough LC/MS/MS (Bld) [Mass/Vol]Everolimus [Mass/volume] in Blood by LC/MS/MS --troughEverolimus Trough Bld LC/MS/MS-mCncEverolimus^troughDRUG/TOXEverolimus trough, BloodMCnc

Frequently asked questions

Code details

Code77349-9

SystemLOINC

Display nameEverolimus trough LC/MS/MS (Bld) [Mass/Vol]

DescriptionEverolimus^trough

Short nameEverolimus Trough Bld LC/MS/MS-mCnc

ComponentEverolimus^trough

PropertyMCnc

TimingPt

System (specimen)Bld

ScaleQn

MethodLC/MS/MS

ClassDRUG/TOX

Example unitsng/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.52

Last changed2.73

Consumer names

Everolimus trough, Blood

Part names

Everolimus^troughMCncPtBldQnLC/MS/MSMass ConcentrationPoint 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.