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.

LOINC

LOINC Code 66332-8: End time - right before going to sleep [PhenX]

Name: LOINC Code 66332-8: End time - right before going to sleep [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:45.459Z

66332-8 is a LOINC code used to identify End time - right before going to sleep [PhenX] 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 End time - right before going to sleep. 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 End time - right before going to sleep. 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: TRIAL
Method: PhenX

What it does not mean

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

Key facts

End time - right before going to sleep [PhenX]
End time - right before going to sleep
Clock time; Diary end time; Point in time; QNT; Quan; Quant; Quantitative; R; Random; RT

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

End time - right before going to sleep [PhenX]Diary end time Clock time PhenXEnd time - right before going to sleepPHENXClockTimePt^Patient

Frequently asked questions

Code details

Code66332-8

SystemLOINC

Display nameEnd time - right before going to sleep [PhenX]

DescriptionEnd time - right before going to sleep

Short nameDiary end time Clock time PhenX

ComponentEnd time - right before going to sleep

PropertyClockTime

TimingPt

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example unitsclock time

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.65

Part names

End time - right before going to sleepClockTimePt^PatientQnPhenXClock timePoint 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.