HealthAssure
HealthAssureGood Life
LOINCActiveObservation

LOINC Code 11873-7: Fetal Femur length/Head circumference derived by US

11873-7 is a LOINC code used to identify Fetal Femur length/Head circumference derived by 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 Femur length/Head 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 Femur length/Head 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: Observation
  • Method: US.derived

What it does not mean

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

Key facts

  • Fetal Femur length/Head circumference derived by US
  • Femur length/Head circumference
  • der US; Echoencephalogram; Echoencephalography; Echography; Fetal; Fl; Girth; Gyn; Gynecology; HC; Len; Length Ratio; Lower extremity; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; 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

Fetal Femur length/Head circumference derived by USFet FL/HC der USFemur length/Head circumferenceOB.USLenRtoPt^Fetus

Frequently asked questions

Code details

Code11873-7
SystemLOINC
Display nameFetal Femur length/Head circumference derived by US
DescriptionFemur length/Head circumference
Short nameFet FL/HC der US
ComponentFemur length/Head circumference
PropertyLenRto
TimingPt
System (specimen)^Fetus
ScaleQn
MethodUS.derived
ClassOB.US
Example unitsratio
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.48

Part names

Femur length/Head circumferenceLenRtoPt^FetusQnUS.derivedLength RatioPoint in time (spot)Ultrasound.derived

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.