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 44735-9: Urea nitrogen/Creatinine (Body fld) [Mass ratio]

Name: LOINC Code 44735-9: Urea nitrogen/Creatinine (Body fld) [Mass ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

44735-9 is a LOINC code used to identify Urea nitrogen/Creatinine (Body fld) [Mass 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 Urea nitrogen/Creatinine. It is commonly used with the system or sample type Body fld.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Urea nitrogen/Creatinine. It is commonly used with the system or sample type Body fld.

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

Urea nitrogen/Creatinine [Mass Ratio] in Body fluid
Urea nitrogen/Creatinine
B/F; BF; Blood urea nitrogen; bod; Bodies; Body fluid; Body fluid, unsp; Chemistry; CR; Crea; Creat; Fl; Fld; FLU; Fluid; Kidney; Mass concentration ratio; Mass ratio; MCRto; N; N2; Nephrology; Nit; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; UN

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Urea nitrogen/Creatinine (Body fld) [Mass ratio] (44735-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Urea nitrogen/Creatinine (Body fld) [Mass ratio]Urea nitrogen/Creatinine [Mass Ratio] in Body fluidUrea nit/Creat FldUrea nitrogen/CreatinineCHEMUrea Nitrogen (BUN)/Creatinine, Body fluidMRto

Frequently asked questions

Code details

Code44735-9

SystemLOINC

Display nameUrea nitrogen/Creatinine (Body fld) [Mass ratio]

DescriptionUrea nitrogen/Creatinine

Short nameUrea nit/Creat Fld

ComponentUrea nitrogen/Creatinine

PropertyMRto

TimingPt

System (specimen)Body fld

ScaleQn

ClassCHEM

Example unitsg/g creatinine

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.17

Last changed2.42

Consumer names

Urea Nitrogen (BUN)/Creatinine, Body fluid

Part names

Urea nitrogen/CreatinineMRtoPtBody fldQnMass RatioPoint in time (spot)Body fluid

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.