LOINCActiveObservation

LOINC Code 11850-5: Gestational sac Mean diameter US

11850-5 is a LOINC code used to identify Gestational sac Mean diameter 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 Diameter.mean. It is commonly used with the system or sample type Gestational sac.

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 Diameter.mean. It is commonly used with the system or sample type Gestational sac.

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.measured

What it does not mean

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

Key facts

Gestational sac Mean diameter US
Diameter.mean
Mean linear measurement of gestational sac, each measurement performed from inner to inner edge. Valid range for use in estimating gestational age10 mm to 60 mm: 5 weeks to 12.2 weeks.
Average; Avg; DIA; Diam; Diam.mean; Echography; Gest; Gestation; GS; GSD; Gyn; Gynecology; Length; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; Prenatal; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; US+Meas

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

Gestational sac Mean diameter USGS Diam.mean US.measDiameter.meanOB.USLenPtGestational sac

Frequently asked questions

Code details

Code11850-5
SystemLOINC
Display nameGestational sac Mean diameter US
DescriptionDiameter.mean
Short nameGS Diam.mean US.meas
ComponentDiameter.mean
PropertyLen
TimingPt
System (specimen)Gestational sac
ScaleQn
MethodUS.measured
ClassOB.US
Example unitsmm
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.73

Part names

Diameter.meanLenPtGestational sacQnUS.measuredLengthPoint in time (spot)Ultrasound.measured

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.

LOINC Code 11850-5 | HealthAssure