LOINCActiveObservation

LOINC Code 98031-8: Body weight discordance in multiple fetuses US+Calculated

98031-8 is a LOINC code used to identify Body weight discordance in multiple fetuses US+Calculated 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 Body weight discordance. It is commonly used with the system or sample type ^Fetuses.

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 Body weight discordance. It is commonly used with the system or sample type ^Fetuses.

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+Calculated

What it does not mean

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

Key facts

Body weight discordance in multiple fetuses US+Calculated
Body weight discordance
The estimated fetal weight discordance (EFWD) is a measure of the weight difference between multiple fetuses during pregnancy. Greater discordance is associated with increased risk of adverse outcomes. It is calculated as 1 - Estimated fetal weight ratio [LOINC98032-6].
Bdy weight; bod; Bodies; Calc; Calculation; Echography; EFW; EFWD; Estimated fetal weight discordance; Fetal; Mass concentration ratio; Mass ratio; MCRto; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; US Calc; Wt; Wt discordance

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

Body weight discordance in multiple fetuses US+CalculatedEFW discordance US+CalcBody weight discordanceOB.USMRtoPt^Fetuses

Frequently asked questions

Code details

Code98031-8
SystemLOINC
Display nameBody weight discordance in multiple fetuses US+Calculated
DescriptionBody weight discordance
Short nameEFW discordance US+Calc
ComponentBody weight discordance
PropertyMRto
TimingPt
System (specimen)^Fetuses
ScaleQn
MethodUS+Calculated
ClassOB.US
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.70
Last changed2.70

Part names

Body weight discordanceMRtoPt^FetusesQnUS+CalculatedMass 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.