LOINCActiveObservation

LOINC Code 11157-5: WBC Nom (BM)

11157-5 is a LOINC code used to identify WBC Nom (BM) 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 Leukocytes. It is commonly used with the system or sample type Bone mar.

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 Leukocytes. It is commonly used with the system or sample type Bone mar.

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

  • Leukocytes [Morphology] in Bone marrow
  • Leukocytes
  • BM; BON; Bone marrow; HEMATOLOGY/CELL COUNTS; Leuc; Leuk; Leukocyte; Lkcs; MAR; Marrow (bone); minimal angle of resolution; Minimum angle of resolution; Morphology; Nominal; Point in time; Random; WBC; WBCs; White blood cell; White blood cells

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

WBC Nom (BM)Leukocytes [Morphology] in Bone marrowWBC MarLeukocytesHEM/BCWhite blood cell (WBC) count, Bone marrowMorph

Frequently asked questions

Code details

Code11157-5
SystemLOINC
Display nameWBC Nom (BM)
DescriptionLeukocytes
Short nameWBC Mar
ComponentLeukocytes
PropertyMorph
TimingPt
System (specimen)Bone mar
ScaleNom
ClassHEM/BC
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.73

Consumer names

White blood cell (WBC) count, Bone marrow

Part names

LeukocytesMorphPtBone marNomMorphologyPoint in time (spot)Bone marrow

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 11157-5 | HealthAssure