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 75556-1: Trisomy 18 prior risk Based on maternal age Nar (fetus)

Name: LOINC Code 75556-1: Trisomy 18 prior risk Based on maternal age Nar (fetus)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:55.159Z

75556-1 is a LOINC code used to identify Trisomy 18 prior risk Based on maternal age Nar (fetus) 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 Trisomy 18 prior risk. It is commonly used with the system or sample type ^Fetus.

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 Trisomy 18 prior risk. It is commonly used with the system or sample type ^Fetus.

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: Based on maternal age

What it does not mean

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

Key facts

Fetal Trisomy 18 prior risk [Likelihood] Based on maternal age Narrative
Trisomy 18 prior risk
Edward syndrome; Fetal; from Mat age; Gyn; Gynecology; Molecular pathology; MOLPATH; MOLPATH.TRISOMY; Narrative; OB; ObGyn; Obstetrics; Point in time; Random; Report; Risk; Ts; Ts 18 prior risk

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

Trisomy 18 prior risk Based on maternal age Nar (fetus)Fetal Trisomy 18 prior risk [Likelihood] Based on maternal age NarrativeFet Ts 18 prior risk from Mat ageTrisomy 18 prior riskMOLPATH.TRISOMYFetal Trisomy 18 prior riskLikelihood

Frequently asked questions

Code details

Code75556-1

SystemLOINC

Display nameTrisomy 18 prior risk Based on maternal age Nar (fetus)

DescriptionTrisomy 18 prior risk

Short nameFet Ts 18 prior risk from Mat age

ComponentTrisomy 18 prior risk

PropertyLikelihood

TimingPt

System (specimen)^Fetus

ScaleNar

MethodBased on maternal age

ClassMOLPATH.TRISOMY

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.50

Last changed2.73

Consumer names

Fetal Trisomy 18 prior risk

Part names

Trisomy 18 prior riskLikelihoodPt^FetusNarBased on maternal agePoint in time (spot)

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.