LOINCActiveObservation

LOINC Code 41264-3: Viscosity Ql (CSF)

41264-3 is a LOINC code used to identify Viscosity Ql (CSF) 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 Viscosity. It is commonly used with the system or sample type CSF.

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 Viscosity. It is commonly used with the system or sample type CSF.

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

Viscosity of Cerebral spinal fluid Qualitative
Viscosity
Viscosity is the measurement of resistance of a liquid to flow. Viscosity is a characteristic property of a fluid and typically is a constant for a given liquid at a given temperature. [PMID16830959] CSF viscosity can be used as an adjunctive measure for the diagnosis of meningitis. [PMID: 20689477]
Cerebral spinal fluid; Cerebrospinal Fl; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen; SPEC; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Vicos; Viscos; Viscosity

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

Viscosity Ql (CSF)Viscosity of Cerebral spinal fluid QualitativeVisc CSF QlViscositySPECViscosity, Spinal fluidVisc

Frequently asked questions

Code details

Code41264-3
SystemLOINC
Display nameViscosity Ql (CSF)
DescriptionViscosity
Short nameVisc CSF Ql
ComponentViscosity
PropertyVisc
TimingPt
System (specimen)CSF
ScaleOrd
ClassSPEC
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.15
Last changed2.54

Consumer names

Viscosity, Spinal fluid

Part names

ViscosityViscPtCSFOrdPoint in time (spot)Cerebral spinal fluid

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 41264-3 | HealthAssure