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LOINC Code 81183-6: Distance of tumor from closest distal margin LM (Spec) [Length]

81183-6 is a LOINC code used to identify Distance of tumor from closest distal margin LM (Spec) [Length] 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 Distance of tumor from closest distal margin. It is commonly used with the system or sample type Specimen.

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 Distance of tumor from closest distal margin. It is commonly used with the system or sample type Specimen.

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

Distance of tumor from closest distal margin [Length] in Specimen by Light microscopy
Distance of tumor from closest distal margin
In a specimen, the distance from the tumor to the nearest distal margin is recorded. The tumor distance to margins is initially based on macroscopic assessment [LOINC81175-2] and confirmed or amended on microscopy, especially when the macroscopic size is difficult to assess (i.e. in early gastric carcinoma and diffuse carcinoma).
Length; LM; Micro; Micros; Microscopic; PATH.HISTO; PATHOLOGY; Point in time; QNT; Quan; Quant; Quantitative; Random; Spec; Tumor from Distal Margin

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

Distance of tumor from closest distal margin LM (Spec) [Length]Distance of tumor from closest distal margin [Length] in Specimen by Light microscopyTumor from Distal Margin Spec MicroDistance of tumor from closest distal marginPATH.HISTODistance of tumor from closest distal margin, SpecimenLen

Frequently asked questions

Code details

Code81183-6
SystemLOINC
Display nameDistance of tumor from closest distal margin LM (Spec) [Length]
DescriptionDistance of tumor from closest distal margin
Short nameTumor from Distal Margin Spec Micro
ComponentDistance of tumor from closest distal margin
PropertyLen
TimingPt
System (specimen)Specimen
ScaleQn
MethodMicroscopy.light
ClassPATH.HISTO
Example unitsmm
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.56
Last changed2.61

Consumer names

Distance of tumor from closest distal margin, Specimen

Part names

Distance of tumor from closest distal marginLenPtSpecimenQnMicroscopy.lightLengthPoint in time (spot)Light 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.