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 30953-4: Date and time of onset of vaccination adverse event

Name: LOINC Code 30953-4: Date and time of onset of vaccination adverse event
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:17.662Z

30953-4 is a LOINC code used to identify Date and time of onset of vaccination adverse event 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 Date and time of onset of vaccination adverse event. 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 Date and time of onset of vaccination adverse event. 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

Date and time of onset of vaccination adverse event
AE; Date and time; Date+time; Date+time onset of vaccine AE; Immunizations; Point in time; QNT; Quan; Quant; Quantitative; Random; Time stamp; Timestamp; Vaccination AE; Vaccine

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

Date and time of onset of vaccination adverse eventDate+time onset of vaccine AEVACCINTmStpPt^PatientQn

Frequently asked questions

Code details

Code30953-4

SystemLOINC

Display nameDate and time of onset of vaccination adverse event

Short nameDate+time onset of vaccine AE

ComponentDate and time of onset of vaccination adverse event

PropertyTmStp

TimingPt

System (specimen)^Patient

ScaleQn

ClassVACCIN

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.04

Last changed2.27

Part names

Date and time of onset of vaccination adverse eventTmStpPt^PatientQnTime 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.