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 33161-1: Fetal Crown Rump length estimated from gestational age by method of Shinozuka 1996 (US)

Name: LOINC Code 33161-1: Fetal Crown Rump length estimated from gestational age by method of Shinozuka 1996 (US)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:20.067Z

33161-1 is a LOINC code used to identify Fetal Crown Rump length estimated from gestational age by method of Shinozuka 1996 (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 Length.crown rump. 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 Length.crown rump. 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.estimated from Shinozuka 1996

What it does not mean

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

Key facts

Fetal Crown Rump length estimated from gestational age by method of Shinozuka 1996 (US)
Length.crown rump
96; CRL; CRL by GA; Crown rump lenth from gestational age; Echography; Est; estimation; Fetal; from GA.Shinozuka96; Gyn; Gynecology; Len; 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 Crown Rump length estimated from gestational age by method of Shinozuka 1996 (US)Fet CRL from GA.Shinozuka96Length.crown rumpOB.USLenPt^Fetus

Frequently asked questions

Code details

Code33161-1

SystemLOINC

Display nameFetal Crown Rump length estimated from gestational age by method of Shinozuka 1996 (US)

DescriptionLength.crown rump

Short nameFet CRL from GA.Shinozuka96

ComponentLength.crown rump

PropertyLen

TimingPt

System (specimen)^Fetus

ScaleQn

MethodUS.estimated from Shinozuka 1996

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

Length.crown rumpLenPt^FetusQnUS.estimated from Shinozuka 1996Crown Rump lengthLengthPoint in time (spot)Ultrasound.estimated from Shinozuka 1996

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.