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 74555-4: Event discovery date and time

Name: LOINC Code 74555-4: Event discovery date and time
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:53.976Z

74555-4 is a LOINC code used to identify Event discovery date and time 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 Event discovery date & time. It is commonly used with the system or sample type ^Event.

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 Event discovery date & time. It is commonly used with the system or sample type ^Event.

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

Event discovery date and time
Event discovery date & time
The month, day, year, and time the event (incident or near miss) was discovered.
Date and time; Point in time; QNT; Quan; Quant; Quantitative; Random; Survey; SURVEY.AHRQ; Time stamp; Timestamp

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

Event discovery date and timeEvent discovery date & timeSURVEY.AHRQTmStpPt^EventQn

Frequently asked questions

Code details

Code74555-4

SystemLOINC

Display nameEvent discovery date and time

DescriptionEvent discovery date & time

ComponentEvent discovery date & time

PropertyTmStp

TimingPt

System (specimen)^Event

ScaleQn

ClassSURVEY.AHRQ

Example unitsMMDDYY

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.48

Last changed2.48

Part names

Event discovery date & timeTmStpPt^EventQnEvent discovery date and timeTime Stamp (Date and Time)Point 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.