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 53418-0: Fibroblast growth factor 23.intact pre Unsp challenge (P) [Mass/Vol]

Name: LOINC Code 53418-0: Fibroblast growth factor 23.intact pre Unsp challenge (P) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:36.030Z

53418-0 is a LOINC code used to identify Fibroblast growth factor 23.intact pre Unsp challenge (P) [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 Fibroblast growth factor 23.intact ^pre XXX challenge. It is commonly used with the system or sample type 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 Fibroblast growth factor 23.intact ^pre XXX challenge. It is commonly used with the system or sample type 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

Fibroblast growth factor 23.intact [Mass/volume] in Plasma --pre XXX challenge
Fibroblast growth factor 23.intact ^pre XXX challenge
Autosomal dominant hypophosphatemic rickets; Before; CHEMISTRY.CHALLENGE TESTING; Fac; Fact; Familial tumoral calcinosis with hyperphosphatemia; FGF 23; FGF23; FGF-23; FGF-23.intact; iFGF23; Level; Mass concentration; Pl; Plasma; Plsm; Point in time; pre chal; QNT; Quan; Quant; Quantitative; Random

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

Fibroblast growth factor 23.intact pre Unsp challenge (P) [Mass/Vol]Fibroblast growth factor 23.intact [Mass/volume] in Plasma --pre XXX challengeFGF-23.intact pre chal Plas-mCncFibroblast growth factor 23.intact ^pre XXX challengeCHALFibroblast growth factor 23.intact before challenge, BloodMCnc

Frequently asked questions

Code details

Code53418-0

SystemLOINC

Display nameFibroblast growth factor 23.intact pre Unsp challenge (P) [Mass/Vol]

DescriptionFibroblast growth factor 23.intact ^pre XXX challenge

Short nameFGF-23.intact pre chal Plas-mCnc

ComponentFibroblast growth factor 23.intact ^pre XXX challenge

PropertyMCnc

TimingPt

System (specimen)Plas

ScaleQn

ClassCHAL

Example unitsng/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.26

Last changed2.70

Consumer names

Fibroblast growth factor 23.intact before challenge, Blood

Part names

Fibroblast growth factor 23.intact ^pre XXX challengeMCncPtPlasQnMass ConcentrationPoint in time (spot)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.