LOINCActiveObservation

LOINC Code 49548-1: Date referral lab test sent

49548-1 is a LOINC code used to identify Date referral lab test sent 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 referral lab test sent. It is commonly used with the system or sample type Referral lab test.

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 referral lab test sent. It is commonly used with the system or sample type Referral lab test.

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 referral lab test sent
  • ?Tm; Date and time; Date ref lab test sent; MISC; QNT; Quan; Quant; Quantitative; Ref Lab Test; 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

Date referral lab test sentDate ref lab test sentMISCTmStpXXXReferral lab testQn

Frequently asked questions

Code details

Code49548-1
SystemLOINC
Display nameDate referral lab test sent
Short nameDate ref lab test sent
ComponentDate referral lab test sent
PropertyTmStp
TimingXXX
System (specimen)Referral lab test
ScaleQn
ClassMISC
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.22
Last changed2.73

Consumer names

Date referral lab test sent

Part names

Date referral lab test sentTmStpXXXReferral lab testQnTime Stamp (Date and Time)Unspecified

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.

LOINC Code 49548-1 | HealthAssure