LOINCActiveObservation

LOINC Code 32138-0: Cystine (Stone) [Mass fraction]

32138-0 is a LOINC code used to identify Cystine (Stone) [Mass fraction] 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 Cystine/Total. It is commonly used with the system or sample type Calculus.

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 Cystine/Total. It is commonly used with the system or sample type Calculus.

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

  • Cystine/Total in Stone
  • Cystine/Total
  • Calc; Calculi; Chemistry; Cys-Cys; Dicysteine; Gastro; Gastroenterology; GI; Kidney; Mass Fraction; Nephrology; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; Stn; Stone; Stones; Tot; Totl

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

Cystine (Stone) [Mass fraction]Cystine/Total in StoneCystine MFr StoneCystine/TotalCHEMCystine, StoneMFr

Frequently asked questions

Code details

Code32138-0
SystemLOINC
Display nameCystine (Stone) [Mass fraction]
DescriptionCystine/Total
Short nameCystine MFr Stone
ComponentCystine/Total
PropertyMFr
TimingPt
System (specimen)Calculus
ScaleQn
ClassCHEM
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.07
Last changed2.73

Consumer names

Cystine, Stone

Part names

Cystine/TotalMFrPtCalculusQnMass fractionPoint in time (spot)Calculus (stone)

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.