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.

LOINCActiveBoth

LOINC Code 75990-2: Energy expended Reporting Period by Indirect calorimetry

Name: LOINC Code 75990-2: Energy expended Reporting Period by Indirect calorimetry
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:56.387Z

75990-2 is a LOINC code used to identify Energy expended Reporting Period by Indirect calorimetry 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 Energy expended. It is commonly used with the system or sample type ^Patient.

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 Energy expended. It is commonly used with the system or sample type ^Patient.

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: Both
Method: Indirect calorimetry

What it does not mean

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

Key facts

Energy expended Reporting Period by Indirect calorimetry
Energy expended
Energy/time; Ind; Ind calorimetry; Indir; Lung; Power; PULMONARY; Pulmonology; QNT; Quan; Quant; Quantitative; Report period; Respiratory

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

Energy expended Reporting Period by Indirect calorimetryEnergy expend RptPeriod Ind calorimetryEnergy expendedPULMEngRatRptPeriod^Patient

Frequently asked questions

Code details

Code75990-2

SystemLOINC

Display nameEnergy expended Reporting Period by Indirect calorimetry

DescriptionEnergy expended

Short nameEnergy expend RptPeriod Ind calorimetry

ComponentEnergy expended

PropertyEngRat

TimingRptPeriod

System (specimen)^Patient

ScaleQn

MethodIndirect calorimetry

ClassPULM

Example unitskcal/kg/d

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.72

Part names

Energy expendedEngRatRptPeriod^PatientQnIndirect calorimetryPower (Energy/Time)Reporting Period

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.