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LOINC Code 63812-2: During the last 48 hours, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop [RIOPA]

63812-2 is a LOINC code used to identify During the last 48 hours, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop [RIOPA] 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 During the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop. 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 During the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop. 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
  • Method: RIOPA

What it does not mean

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

Key facts

  • During the last 48 hours, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop [RIOPA]
  • During the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop
  • 2 days; 2D; 48 hours; 48HR; Finding; Findings; Operate near diesel vehicle; Ordinal; Past; PhenX; Ql; Qual; Qualitative; Screen; Study report

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

During the last 48 hours, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop [RIOPA]Operate near diesel vehicle RIOPADuring the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stopPHENXFind48H^Patient

Frequently asked questions

Code details

Code63812-2
SystemLOINC
Display nameDuring the last 48 hours, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop [RIOPA]
DescriptionDuring the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop
Short nameOperate near diesel vehicle RIOPA
ComponentDuring the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stop
PropertyFind
Timing48H
System (specimen)^Patient
ScaleOrd
MethodRIOPA
ClassPHENX
StatusACTIVE

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.36
Last changed2.65

Part names

During the last 48H, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stopFind48H^PatientOrdRIOPADuring the last 48 hours, the study period, have you operated or been near diesel engines, e.g. bus terminal, truck stopFinding48 hours

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.