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 78515-4: Lactose 15 Min post dose lactose PO [Moles/Vol]

Name: LOINC Code 78515-4: Lactose 15 Min post dose lactose PO [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:00.204Z

78515-4 is a LOINC code used to identify Lactose 15 Min post dose lactose PO [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 Lactose^15M post dose lactose PO. 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 Lactose^15M post dose lactose PO. 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: Both

What it does not mean

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

Key facts

Lactose [Moles/volume] in Serum or Plasma --15 minutes post dose lactose PO
Lactose^15M post dose lactose PO
15M p Lac PO; After; CHEMISTRY.CHALLENGE TESTING; Level; LTT; p dose; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration

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

Lactose 15 Min post dose lactose PO [Moles/Vol]Lactose [Moles/volume] in Serum or Plasma --15 minutes post dose lactose POLactose 15M p Lac PO SerPl-sCncLactose^15M post dose lactose POCHALLactose 15 min after lactose by mouth, BloodSCnc

Frequently asked questions

Code details

Code78515-4

SystemLOINC

Display nameLactose 15 Min post dose lactose PO [Moles/Vol]

DescriptionLactose^15M post dose lactose PO

Short nameLactose 15M p Lac PO SerPl-sCnc

ComponentLactose^15M post dose lactose PO

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsmmol/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Consumer names

Lactose 15 min after lactose by mouth, Blood

Part names

Lactose^15M post dose lactose POSCncPtSer/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.