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 57566-2: 25-hydroxyvitamin D3 pre dose calcium [Moles/Vol]

Name: LOINC Code 57566-2: 25-hydroxyvitamin D3 pre dose calcium [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.757Z

57566-2 is a LOINC code used to identify 25-hydroxyvitamin D3 pre dose calcium [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 Calcidiol^pre dose calcium. 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 Calcidiol^pre dose calcium. 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

25-hydroxyvitamin D3 [Moles/volume] in Serum or Plasma --pre dose calcium
Calcidiol^pre dose calcium
25(OH)D3; 25-hydroxycholecalciferol; 25-hydroxyvitamin D 3; 25-hydroxyvitamin D3; Before; Ca; Cal; Calciderol; Calcifediol; CHEMISTRY.CHALLENGE TESTING; Level; Pl; Plasma; Plsm; Point in time; pre Ca; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration; Vitamin D 25 hydroxy

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

25-hydroxyvitamin D3 pre dose calcium [Moles/Vol]25-hydroxyvitamin D3 [Moles/volume] in Serum or Plasma --pre dose calcium25(OH)D3 pre Ca SerPl-sCncCalcidiol^pre dose calciumCHAL25-hydroxyvitamin D3 before dose Calcium, BloodSCnc

Frequently asked questions

Code details

Code57566-2

SystemLOINC

Display name25-hydroxyvitamin D3 pre dose calcium [Moles/Vol]

DescriptionCalcidiol^pre dose calcium

Short name25(OH)D3 pre Ca SerPl-sCnc

ComponentCalcidiol^pre dose calcium

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsnmol/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.29

Last changed2.70

Consumer names

25-hydroxyvitamin D3 before dose Calcium, Blood

Part names

Calcidiol^pre dose calciumSCncPtSer/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.