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 94544-4: Exposure source in 30 days prior to onset of illness

Name: LOINC Code 94544-4: Exposure source in 30 days prior to onset of illness
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:24.121Z

94544-4 is a LOINC code used to identify Exposure source in 30 days prior to onset of illness 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 Exposure source in 30D prior to onset of illness. 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 Exposure source in 30D prior to onset of illness. 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: Observation

What it does not mean

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

Key facts

Exposure source in 30 days prior to onset of illness
Exposure source in 30D prior to onset of illness
Exp; Exp source 30D prior onset; H+P; H+P.HX; Nominal; P prime; Point in time; Random; Srce; Typ

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

Exposure source in 30 days prior to onset of illnessExp source 30D prior onsetExposure source in 30D prior to onset of illnessH&P.HXTypePt^Patient

Frequently asked questions

Code details

Code94544-4

SystemLOINC

Display nameExposure source in 30 days prior to onset of illness

DescriptionExposure source in 30D prior to onset of illness

Short nameExp source 30D prior onset

ComponentExposure source in 30D prior to onset of illness

PropertyType

TimingPt

System (specimen)^Patient

ScaleNom

ClassH&P.HX

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.68

Last changed2.68

Part names

Exposure source in 30D prior to onset of illnessTypePt^PatientNomExposure source in 30 days prior to onset of illnessPoint 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.