What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 30398-2: Hematocrit Calc (CSF) [Volume fraction]

Name: LOINC Code 30398-2: Hematocrit Calc (CSF) [Volume fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:16.075Z

30398-2 is a LOINC code used to identify Hematocrit Calc (CSF) [Volume 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 Erythrocyte/Specimen Volume. It is commonly used with the system or sample type CSF.

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 Erythrocyte/Specimen Volume. 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: Both
Method: Calculated

What it does not mean

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

Key facts

Hematocrit [Volume Fraction] of Cerebral spinal fluid by calculation
Erythrocyte/Specimen Volume
Calc; Calculation; Cerebral spinal fluid; Cerebrospinal Fl; Discocyte; Erc; Erythrocytes; HEMATOLOGY/CELL COUNTS; Neuro; Neurology; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; RBC; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Spec; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Vol; Volfr; Volume fraction

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

Hematocrit Calc (CSF) [Volume fraction]Hematocrit [Volume Fraction] of Cerebral spinal fluid by calculationHct VFr CSF CalcErythrocyte/Specimen VolumeHEM/BCHematocrit, Spinal fluidVFr

Frequently asked questions

Code details

Code30398-2

SystemLOINC

Display nameHematocrit Calc (CSF) [Volume fraction]

DescriptionErythrocyte/Specimen Volume

Short nameHct VFr CSF Calc

ComponentErythrocyte/Specimen Volume

PropertyVFr

TimingPt

System (specimen)CSF

ScaleQn

MethodCalculated

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.04

Last changed2.79

Consumer names

Hematocrit, Spinal fluid

Part names

Erythrocyte/Specimen VolumeVFrPtCSFQnCalculatedVolume FractionPoint 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.