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.

LOINCObservation

LOINC Code 33182-7: Deprecated Head circumference/Abdominal circumference estimated from gestational age by method of Campbell 1997 (US)

Name: LOINC Code 33182-7: Deprecated Head circumference/Abdominal circumference estimated from gestational age by method of Campbell 1997 (US)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:20.067Z

33182-7 is a LOINC code used to identify Deprecated Head circumference/Abdominal circumference estimated from gestational age by method of Campbell 1997 (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 Head circumference/Abdominal circumference. 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 Head circumference/Abdominal circumference. 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: DEPRECATED
Order vs observation: Observation
Method: US.estimated from Campbell 1997

What it does not mean

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

Key facts

Deprecated Head circumference/Abdominal circumference estimated from gestational age by method of Campbell 1997 (US)
Head circumference/Abdominal circumference
97; Abd; Abdo; Abdomen; AC; Echoencephalogram; Echoencephalography; Echography; Est; estimation; Fetal; from GA.Campbell97; Girth; Gyn; Gynecology; HC; Length Ratio; 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

Deprecated Head circumference/Abdominal circumference estimated from gestational age by method of Campbell 1997 (US)Deprecated HC/AC from GA.Campbell97Head circumference/Abdominal circumferenceOB.USLenRtoPt^Fetus

Frequently asked questions

Code details

Code33182-7

SystemLOINC

Display nameDeprecated Head circumference/Abdominal circumference estimated from gestational age by method of Campbell 1997 (US)

DescriptionHead circumference/Abdominal circumference

Short nameDeprecated HC/AC from GA.Campbell97

ComponentHead circumference/Abdominal circumference

PropertyLenRto

TimingPt

System (specimen)^Fetus

ScaleQn

MethodUS.estimated from Campbell 1997

ClassOB.US

Example unitsratio

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.54

Part names

Head circumference/Abdominal circumferenceLenRtoPt^FetusQnUS.estimated from Campbell 1997Length RatioPoint in time (spot)Ultrasound.estimated from Campbell 1997

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.