LOINCActiveObservation

LOINC Code 96504-6: Protein/Osmolality (U) [Ratio]

96504-6 is a LOINC code used to identify Protein/Osmolality (U) [Ratio] 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 Protein/Osmolality. 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 Protein/Osmolality. 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

Protein/Osmolality [Ratio] in Urine
Protein/Osmolality
The urine protein to osmolality ratio is significantly correlated with 24-hour urine protein excretion and can be used as a simple measure of proteinuria without the need for 24-hour urine collection. [PMID18425406]
Chemistry; Kidney; Nephrology; Osmo; Osmol; osmolarity; Point in time; PR; Prot; QNT; Quan; Quant; Quantitative; Random; Ratios; Renal; Rto; 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

Protein/Osmolality (U) [Ratio]Protein/Osmolality [Ratio] in UrineProt/Osmolality Ur-RtoProtein/OsmolalityCHEMProtein/Osmolality, UrineRatio

Frequently asked questions

Code details

Code96504-6
SystemLOINC
Display nameProtein/Osmolality (U) [Ratio]
DescriptionProtein/Osmolality
Short nameProt/Osmolality Ur-Rto
ComponentProtein/Osmolality
PropertyRatio
TimingPt
System (specimen)Urine
ScaleQn
ClassCHEM
Example unitsratio
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.69
Last changed2.69

Consumer names

Protein/Osmolality, Urine

Part names

Protein/OsmolalityRatioPtUrineQnPoint 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.

LOINC Code 96504-6 | HealthAssure