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 58853-3: Osmolality post 30 Min fluid fast (U) [Osmolality]

Name: LOINC Code 58853-3: Osmolality post 30 Min fluid fast (U) [Osmolality]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:39.276Z

58853-3 is a LOINC code used to identify Osmolality post 30 Min fluid fast (U) [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^post 30M FFst. 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 Osmolality^post 30M FFst. 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

Osmolality of Urine--30 minutes post fluid fast
Osmolality^post 30M FFst
After; CHEMISTRY.CHALLENGE TESTING; Osmo; Osmol; Osmolality; osmolarity; p 30M FFST; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; UA; UR; Urn

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 post 30 Min fluid fast (U) [Osmolality]Osmolality of Urine--30 minutes post fluid fastOsmolality p 30M FFST UrOsmolality^post 30M FFstCHALOsmolality after 30 min fluid fast, UrineOsmol

Frequently asked questions

Code details

Code58853-3

SystemLOINC

Display nameOsmolality post 30 Min fluid fast (U) [Osmolality]

DescriptionOsmolality^post 30M FFst

Short nameOsmolality p 30M FFST Ur

ComponentOsmolality^post 30M FFst

PropertyOsmol

TimingPt

System (specimen)Urine

ScaleQn

ClassCHAL

Example unitsmOsm/kg

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.32

Last changed2.70

Consumer names

Osmolality after 30 min fluid fast, Urine

Part names

Osmolality^post 30M FFstOsmolPtUrineQnOsmolalityPoint in time (spot)

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.