LOINCActiveBoth

LOINC Code 101131-1: B-cell precursors FC (BM)

101131-1 is a LOINC code used to identify B-cell precursors FC (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 B-cell precursors. It is commonly used with the system or sample type Bone mar.

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 B-cell precursors. 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: Both
  • Method: Flow cytometry

What it does not mean

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

Key facts

B-cell precursors in Bone marrow by Flow cytometry (FC)
B-cell precursors
B-cell precursors are cells that differentiate into mature B lymphocytes. The four major types of B-cell precursors are pro-B-cells, pre-B-I cells, pre-B-II cells, and immature cells. [PMID31849931]
B Cell; B-ALL; B-cell acute lymphoblastic leukemia; BCELLS; BM; BON; Bone marrow; Dynamic; FC; HEMATOLOGY/CELL COUNTS; MAR; Marrow (bone); minimal angle of resolution; Minimum angle of resolution; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random

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

B-cell precursors FC (BM)B-cell precursors in Bone marrow by Flow cytometry (FC)B-cell precursors NFr Mar FCB-cell precursorsHEM/BCB-cell precursors, Bone marrowNFr

Frequently asked questions

Code details

Code101131-1
SystemLOINC
Display nameB-cell precursors FC (BM)
DescriptionB-cell precursors
Short nameB-cell precursors NFr Mar FC
ComponentB-cell precursors
PropertyNFr
TimingPt
System (specimen)Bone mar
ScaleQn
MethodFlow cytometry
ClassHEM/BC
Example units%
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.74
Last changed2.81

Consumer names

B-cell precursors, Bone marrow

Part names

B-cell precursorsNFrPtBone marQnFlow cytometryNumber FractionPoint in time (spot)Bone marrowFlow cytometry (FC)

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 101131-1 | HealthAssure