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 104998-0: Main pulmonary artery Peak pressure gradient by US

Name: LOINC Code 104998-0: Main pulmonary artery Peak pressure gradient by US
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:19.132Z

104998-0 is a LOINC code used to identify Main pulmonary artery Peak pressure gradient 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 Pressure gradient.max. It is commonly used with the system or sample type Pulmonary artery.main.

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 Pressure gradient.max. It is commonly used with the system or sample type Pulmonary artery.main.

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

What it does not mean

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

Key facts

Main pulmonary artery Peak pressure gradient by US
Pressure gradient.max
Art; CARD.US; Cardiology; Echography; Grad; Largest; Maximal; Maximum; MPA; PA; Peak; Peak press grad; Point in time; Press grad; 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

Main pulmonary artery Peak pressure gradient by USMPA Peak press grad USPressure gradient.maxCARD.USPressDiffPtPulmonary artery.main

Frequently asked questions

Code details

Code104998-0

SystemLOINC

Display nameMain pulmonary artery Peak pressure gradient by US

DescriptionPressure gradient.max

Short nameMPA Peak press grad US

ComponentPressure gradient.max

PropertyPressDiff

TimingPt

System (specimen)Pulmonary artery.main

ScaleQn

MethodUS

ClassCARD.US

Example unitsmm Hg

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.78

Last changed2.78

Part names

Pressure gradient.maxPressDiffPtPulmonary artery.mainQnUSGradient maximumPressure DifferencePoint in time (spot)Pulmonary artery mainUltrasound

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.