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 50403-5: Blood pressure systolic and diastolic--before transfusion

Name: LOINC Code 50403-5: Blood pressure systolic and diastolic--before transfusion
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.496Z

50403-5 is a LOINC code used to identify Blood pressure systolic and diastolic--before transfusion 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 Blood pressure systolic & diastolic^pre transfusion. It is commonly used with the system or sample type Arterial system.

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 Blood pressure systolic & diastolic^pre transfusion. It is commonly used with the system or sample type Arterial system.

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

What it does not mean

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

Key facts

Blood pressure systolic and diastolic--before transfusion
Blood pressure systolic & diastolic^pre transfusion
Art sys; Before; BLOOD PRESSURE MEASUREMENTS.ATOM; BP; BP sys/dias; Dias; Diast; Diastoli; Point in time; Pressure; QNT; Quan; Quant; Quantitative; Random; Tx

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

Blood pressure systolic and diastolic--before transfusionBP sys/dias--pre transfBlood pressure systolic & diastolic^pre transfusionBP.ATOMPresPtArterial system

Frequently asked questions

Code details

Code50403-5

SystemLOINC

Display nameBlood pressure systolic and diastolic--before transfusion

DescriptionBlood pressure systolic & diastolic^pre transfusion

Short nameBP sys/dias--pre transf

ComponentBlood pressure systolic & diastolic^pre transfusion

PropertyPres

TimingPt

System (specimen)Arterial system

ScaleQn

ClassBP.ATOM

Example unitsmm Hg

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.73

Part names

Blood pressure systolic & diastolic^pre transfusionPresPtArterial systemQnPressurePoint 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.