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 77021-4: Y chromosome Sequencing Ql (cfDNA)

Name: LOINC Code 77021-4: Y chromosome Sequencing Ql (cfDNA)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:57.647Z

77021-4 is a LOINC code used to identify Y chromosome Sequencing Ql (cfDNA) 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 Fetal Y chromosome. It is commonly used with the system or sample type Plas.cfDNA.

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 Fetal Y chromosome. It is commonly used with the system or sample type Plas.cfDNA.

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: Sequencing

What it does not mean

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

Key facts

Fetal Y chromosome [Presence] based on Plasma cell-free DNA by Sequencing
Fetal Y chromosome
Chromosom; Chromosomes; Genetics; Heredity; Heritable; high-throughput sequencing; HTS; Inherited; Molecular pathology; MOLPATH; Next generation sequencing; NGS; Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Y chromosome microdeletion

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

Y chromosome Sequencing Ql (cfDNA)Fetal Y chromosome [Presence] based on Plasma cell-free DNA by SequencingFet Y Chrom Plas.cfDNA QlFetal Y chromosomeMOLPATHPrThrPt

Frequently asked questions

Code details

Code77021-4

SystemLOINC

Display nameY chromosome Sequencing Ql (cfDNA)

DescriptionFetal Y chromosome

Short nameFet Y Chrom Plas.cfDNA Ql

ComponentFetal Y chromosome

PropertyPrThr

TimingPt

System (specimen)Plas.cfDNA

ScaleOrd

MethodSequencing

ClassMOLPATH

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.52

Last changed2.73

Consumer names

Fetal Y chromosome

Part names

Fetal Y chromosomePrThrPtPlas.cfDNAOrdSequencingPresence or ThresholdPoint in time (spot)Plasma cell-free DNA

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.