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 94004-9: Osmolality 1 Hr post dose vasopressin [Osmolality]

Name: LOINC Code 94004-9: Osmolality 1 Hr post dose vasopressin [Osmolality]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:23.054Z

94004-9 is a LOINC code used to identify Osmolality 1 Hr post dose vasopressin [Osmolality] 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 Osmolality^1H post dose vasopressin. 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 Osmolality^1H post dose vasopressin. 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

Osmolality of Serum or Plasma--1 hour post dose vasopressin
Osmolality^1H post dose vasopressin
1 hour; 1.0Hr; 1h p Vaso; 60 min; 60 minutes; 60M; 60min; ADH; Adiuretin; After; Antidiuretic hormone; Arginine vasopressin hormone; AVH; CHEMISTRY.CHALLENGE TESTING; Osmo; Osmol; Osmolality; osmolarity; p dose; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; VP

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

Osmolality 1 Hr post dose vasopressin [Osmolality]Osmolality of Serum or Plasma--1 hour post dose vasopressinOsmolality 1h p Vaso SerPlOsmolality^1H post dose vasopressinCHALOsmolality 1 hr after vasopressin, BloodOsmol

Frequently asked questions

Code details

Code94004-9

SystemLOINC

Display nameOsmolality 1 Hr post dose vasopressin [Osmolality]

DescriptionOsmolality^1H post dose vasopressin

Short nameOsmolality 1h p Vaso SerPl

ComponentOsmolality^1H post dose vasopressin

PropertyOsmol

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHAL

Example unitsmOsm/kg

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.67

Last changed2.67

Consumer names

Osmolality 1 hr after vasopressin, Blood

Part names

Osmolality^1H post dose vasopressinOsmolPtSer/PlasQnOsmolalityPoint 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.