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 33148-8: Fetal Abdomen Circumference estimated from gestational age by method of Merz 1988 (US)

Name: LOINC Code 33148-8: Fetal Abdomen Circumference estimated from gestational age by method of Merz 1988 (US)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:20.067Z

33148-8 is a LOINC code used to identify Fetal Abdomen Circumference estimated from gestational age by method of Merz 1988 (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 Perimeter. It is commonly used with the system or sample type Abdomen^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 Perimeter. It is commonly used with the system or sample type Abdomen^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.estimated from Merz 1988

What it does not mean

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

Key facts

Fetal Abdomen Circumference estimated from gestational age by method of Merz 1988 (US)
Perimeter
88; Abd; Abd^Fetus; Abd+Fetus; Abdo; Abdomen+; Abdominal; Abdominal circumference; Abdominal circumference from gestational age; AC; AC by GA; AC(GA); Circum; Circumference; Echography; Est; estimation; Fetal; from GA.Merz88; Gyn; Gynecology; Length; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; predicted; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; US+est

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 Abdomen Circumference estimated from gestational age by method of Merz 1988 (US)Fet Abd Circum from GA.Merz88PerimeterOB.USLenPtAbdomen^fetus

Frequently asked questions

Code details

Code33148-8

SystemLOINC

Display nameFetal Abdomen Circumference estimated from gestational age by method of Merz 1988 (US)

DescriptionPerimeter

Short nameFet Abd Circum from GA.Merz88

ComponentPerimeter

PropertyLen

TimingPt

System (specimen)Abdomen^Fetus

ScaleQn

MethodUS.estimated from Merz 1988

ClassOB.US

Example unitsmm

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.70

Part names

PerimeterLenPtAbdomen^fetusQnUS.estimated from Merz 1988LengthPoint in time (spot)Ultrasound.estimated from Merz 1988

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.