LOINCActiveObservation

LOINC Code 42452-3: Fetal Narrative [Interpretation] Study observation.general 1st trimester US

42452-3 is a LOINC code used to identify Fetal Narrative [Interpretation] Study observation.general 1st trimester US 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 Study observation.general 1st trimester. 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 Study observation.general 1st trimester. 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: Observation
  • Method: US

What it does not mean

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

Key facts

  • Fetal Narrative [Interpretation] Study observation.general 1st trimester US
  • Study observation.general 1st trimester
  • Echography; Fetal; First; Gyn; Gynecology; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Narrative; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; Random; Report; Sonogram; Sonograph; Sonography; Study 1st trim; Study report; ULS; Ultrasound

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

Fetal Narrative [Interpretation] Study observation.general 1st trimester USUS Fetus Study 1st trim [Imp]Study observation.general 1st trimesterOB.USImpPt^Fetus

Frequently asked questions

Code details

Code42452-3
SystemLOINC
Display nameFetal Narrative [Interpretation] Study observation.general 1st trimester US
DescriptionStudy observation.general 1st trimester
Short nameUS Fetus Study 1st trim [Imp]
ComponentStudy observation.general 1st trimester
PropertyImp
TimingPt
System (specimen)^Fetus
ScaleNar
MethodUS
ClassOB.US
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.16
Last changed2.50

Part names

Study observation.general 1st trimesterImpPt^FetusNarUSImpression/interpretation of studyPoint in time (spot)Ultrasound

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.

LOINC Code 42452-3 | HealthAssure