LOINCActiveObservation

LOINC Code 68903-4: RBC Unsp time LM (Urine sed) [#/Time]

68903-4 is a LOINC code used to identify RBC Unsp time LM (Urine sed) [#/Time] 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 Erythrocytes. It is commonly used with the system or sample type Urine sed.

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 Erythrocytes. It is commonly used with the system or sample type Urine sed.

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
  • Method: Microscopy.light

What it does not mean

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

Key facts

  • Erythrocytes by Light microscopy in Urine sediment collected for unspecified duration
  • Erythrocytes
  • ?Tm; Addis count; Count/time; Discocytes; Erthrocyte; Erythrocyte; Kidney; LM; Micro; Micros; Microscopic; Nephrology; nRate; Number rate; Number Rate = Count/Time; QNT; Quan; Quant; Quantitative; RBC; RBCS; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Renal; UA; UR; URINALYSIS; Urine sediment; Urn; UrnS

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

RBC Unsp time LM (Urine sed) [#/Time]Erythrocytes by Light microscopy in Urine sediment collected for unspecified durationRBC ?Tm UrnS Micro-nRateErythrocytesUARed Blood Cell (RBC) Count, Urine sedimentNRat

Frequently asked questions

Code details

Code68903-4
SystemLOINC
Display nameRBC Unsp time LM (Urine sed) [#/Time]
DescriptionErythrocytes
Short nameRBC ?Tm UrnS Micro-nRate
ComponentErythrocytes
PropertyNRat
TimingXXX
System (specimen)Urine sed
ScaleQn
MethodMicroscopy.light
ClassUA
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.38
Last changed2.70

Consumer names

Red Blood Cell (RBC) Count, Urine sediment

Part names

ErythrocytesNRatXXXUrine sedQnMicroscopy.lightNumber RateUnspecifiedUrine sedimentLight microscopy

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 68903-4 | HealthAssure