LOINCActiveObservation

LOINC Code 75977-9: Chr X and Y aneuploidy Dosage of chromosome-specific cfDNA Ql (cfDNA)

75977-9 is a LOINC code used to identify Chr X and Y aneuploidy Dosage of chromosome-specific cfDNA 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 chromosome X & Y aneuploidy. 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 chromosome X & Y aneuploidy. 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: Dosage of chromosome specific cf DNA

What it does not mean

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

Key facts

Fetal Chromosome X and Y aneuploidy [Presence] based on Plasma cell-free DNA by Dosage of chromosome-specific cfDNA
Fetal chromosome X & Y aneuploidy
Indicates the presence of chromosome X & or Y aneuploidy based on noninvasive prenatal screening methods using cell-free DNA (cfDNA) in maternal plasma. Result does not indicate the X or Y aneuploidy suspected or detected, if present. This finding is reporting using the term for chromosome X & Y analysis in cfDNA [LOINC73822-9].
Chr X + Y aneup; Chromosom; Chromosomes; MISC; Miscellaneous molecular pathology; Molecular pathology; MOLPATH; Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Spec

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

Chr X and Y aneuploidy Dosage of chromosome-specific cfDNA Ql (cfDNA)Fetal Chromosome X and Y aneuploidy [Presence] based on Plasma cell-free DNA by Dosage of chromosome-specific cfDNAFet Chr X + Y aneup Plas.cfDNA QlFetal chromosome X & Y aneuploidyMOLPATH.MISCFetal Chromosome X and Y AneuploidyPrThr

Frequently asked questions

Code details

Code75977-9
SystemLOINC
Display nameChr X and Y aneuploidy Dosage of chromosome-specific cfDNA Ql (cfDNA)
DescriptionFetal chromosome X & Y aneuploidy
Short nameFet Chr X + Y aneup Plas.cfDNA Ql
ComponentFetal chromosome X & Y aneuploidy
PropertyPrThr
TimingPt
System (specimen)Plas.cfDNA
ScaleOrd
MethodDosage of chromosome specific cf DNA
ClassMOLPATH.MISC
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.50
Last changed2.73

Consumer names

Fetal Chromosome X and Y Aneuploidy

Part names

Fetal chromosome X & Y aneuploidyPrThrPtPlas.cfDNAOrdDosage of chromosome specific cf DNAFetal chromosome X and Y aneuploidyPresence or ThresholdPoint in time (spot)Plasma cell-free DNADosage of chromosome-specific cfDNA

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.