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 80416-1: Head circumference/Abdominal circumference US+Estimated from Campbell 1977

Name: LOINC Code 80416-1: Head circumference/Abdominal circumference US+Estimated from Campbell 1977
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:03.792Z

80416-1 is a LOINC code used to identify Head circumference/Abdominal circumference US+Estimated from Campbell 1977 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: ACTIVE
Order vs observation: Both
Method: US+Estimated from Campbell 1977

What it does not mean

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

Key facts

Head circumference/Abdominal circumference US+Estimated from Campbell 1977
Head circumference/Abdominal circumference
Abd; Abdo; Abdomen; AC; Echoencephalogram; Echoencephalography; Echography; Est; estimation; Fetal; 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

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

Head circumference/Abdominal circumference US+Estimated from Campbell 1977HC/AC from Campbell 1977Head circumference/Abdominal circumferenceOB.USLenRtoPt^Fetus

Frequently asked questions

Code details

Code80416-1

SystemLOINC

Display nameHead circumference/Abdominal circumference US+Estimated from Campbell 1977

DescriptionHead circumference/Abdominal circumference

Short nameHC/AC from Campbell 1977

ComponentHead circumference/Abdominal circumference

PropertyLenRto

TimingPt

System (specimen)^Fetus

ScaleQn

MethodUS+Estimated from Campbell 1977

ClassOB.US

Example unitsratio

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Part names

Head circumference/Abdominal circumferenceLenRtoPt^FetusQnUS+Estimated from Campbell 1977Length RatioPoint 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.