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 73704-9: Fluid output.nasogastric tube Measured

Name: LOINC Code 73704-9: Fluid output.nasogastric tube Measured
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:52.635Z

73704-9 is a LOINC code used to identify Fluid output.nasogastric tube Measured 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 Fluid output.nasogastric tube. It is commonly used with the system or sample type Upper GI tract.

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 Fluid output.nasogastric tube. It is commonly used with the system or sample type Upper GI tract.

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: Measured

What it does not mean

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

Key facts

Fluid output.nasogastric tube Measured
Fluid output.nasogastric tube
Measured nasograstic tube fluid output is reported when monitoring patient fluid balance.
Fld; Fluid output NG-tube; IO_OUTPUT; IO_OUTPUT.MOLEC; Nasal tube; Point in time; QNT; Quan; Quant; Quantitative; Random; UGI; Up; Upr GI Tract; Volume

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

Fluid output.nasogastric tube MeasuredFluid output NG-tube MeasuredFluid output.nasogastric tubeIO_OUT.MOLECVolPtUpper GI tract

Frequently asked questions

Code details

Code73704-9

SystemLOINC

Display nameFluid output.nasogastric tube Measured

DescriptionFluid output.nasogastric tube

Short nameFluid output NG-tube Measured

ComponentFluid output.nasogastric tube

PropertyVol

TimingPt

System (specimen)Upper GI tract

ScaleQn

MethodMeasured

ClassIO_OUT.MOLEC

Example unitsmL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.44

Last changed2.73

Part names

Fluid output.nasogastric tubeVolPtUpper GI tractQnMeasuredVolumePoint 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.