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 30904-7: Cobalamin (Vitamin B12) post dose cyanocobalamin Qn (24H U)

Name: LOINC Code 30904-7: Cobalamin (Vitamin B12) post dose cyanocobalamin Qn (24H U)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:17.662Z

30904-7 is a LOINC code used to identify Cobalamin (Vitamin B12) post dose cyanocobalamin Qn (24H U) 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 Cobalamins^post dose cyanocobalamin. It is commonly used with the system or sample type Urine.

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 Cobalamins^post dose cyanocobalamin. It is commonly used with the system or sample type Urine.

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

Cobalamin (Vitamin B12) [Units/volume] in 24 hour Urine --post dose cyanocobalamin
Cobalamins^post dose cyanocobalamin
Co58 labelled Vitamin B12 (Schillings test)
1 day; 24 hours; 24HR; After; Arbitrary concentration; c133; C721; Cbl; CHEMISTRY.CHALLENGE TESTING; CN-Cbl; Cobalamin; p B12; p dose; PST; QNT; Quan; Quant; Quantitative; Schilling test; Schillings test; UA; UR; Urn; Vit B12; Vitamin B12

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

Cobalamin (Vitamin B12) post dose cyanocobalamin Qn (24H U)Cobalamin (Vitamin B12) [Units/volume] in 24 hour Urine --post dose cyanocobalaminVit B12 p B12 24h Ur-aCncCobalamins^post dose cyanocobalaminCHALCobalamin (Vitamin B12) after dose Cyanocobalamin, UrineACnc

Frequently asked questions

Code details

Code30904-7

SystemLOINC

Display nameCobalamin (Vitamin B12) post dose cyanocobalamin Qn (24H U)

DescriptionCobalamins^post dose cyanocobalamin

Short nameVit B12 p B12 24h Ur-aCnc

ComponentCobalamins^post dose cyanocobalamin

PropertyACnc

Timing24H

System (specimen)Urine

ScaleQn

ClassCHAL

Example units% excretion

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.04

Last changed2.40

Consumer names

Cobalamin (Vitamin B12) after dose Cyanocobalamin, Urine

Part names

Cobalamins^post dose cyanocobalaminACnc24HUrineQnArbitrary Concentration24 hours

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.