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.

LOINCActiveObservation

LOINC Code 4591-4: Hemoglobin Hope Elph pH 6.3 Ql (Bld)

Name: LOINC Code 4591-4: Hemoglobin Hope Elph pH 6.3 Ql (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:31.116Z

4591-4 is a LOINC code used to identify Hemoglobin Hope Elph pH 6.3 Ql (Bld) 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 Hemoglobin Hope. It is commonly used with the system or sample type Bld.

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 Hemoglobin Hope. It is commonly used with the system or sample type Bld.

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
Method: Electrophoresis pH 6.3

What it does not mean

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

Key facts

Hemoglobin Hope [Presence] in Blood by Electrophoresis acid (pH 6.3)
Hemoglobin Hope
Blood; Elec; Elect; Electr; Electro; Electrophhrs; Electrophrs; Elp; Elph; Elph Acid; Ep; Haemoglobin; Hb; HEMATOLOGY/CELL COUNTS; Hgb; Hgb Hope; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; WB; Whole blood

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

Hemoglobin Hope Elph pH 6.3 Ql (Bld)Hemoglobin Hope [Presence] in Blood by Electrophoresis acid (pH 6.3)Hgb Hope Bld Ql Elph AcidHemoglobin HopeHEM/BCHemoglobin Hope, BloodPrThr

Frequently asked questions

Code details

Code4591-4

SystemLOINC

Display nameHemoglobin Hope Elph pH 6.3 Ql (Bld)

DescriptionHemoglobin Hope

Short nameHgb Hope Bld Ql Elph Acid

ComponentHemoglobin Hope

PropertyPrThr

TimingPt

System (specimen)Bld

ScaleOrd

MethodElectrophoresis pH 6.3

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.56

Consumer names

Hemoglobin Hope, Blood

Part names

Hemoglobin HopePrThrPtBldOrdElectrophoresis pH 6.3Presence or ThresholdPoint in time (spot)BloodElectrophoresis acid (pH 6.3)

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.