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 64543-2: What time does your child usually go to bed during the week [PhenX]

Name: LOINC Code 64543-2: What time does your child usually go to bed during the week [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:43.951Z

64543-2 is a LOINC code used to identify What time does your child usually go to bed during the week [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 What time does your child usually go to bed during the week. 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 What time does your child usually go to bed during the week. 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

What time does your child usually go to bed during the week [PhenX]
What time does your child usually go to bed during the week
Clock time; Point in time; QNT; Quan; Quant; Quantitative; Random; Time child bed weekday

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

What time does your child usually go to bed during the week [PhenX]Time child bed weekday Clock time PhenXWhat time does your child usually go to bed during the weekPHENXClockTimePt^Patient

Frequently asked questions

Code details

Code64543-2

SystemLOINC

Display nameWhat time does your child usually go to bed during the week [PhenX]

DescriptionWhat time does your child usually go to bed during the week

Short nameTime child bed weekday Clock time PhenX

ComponentWhat time does your child usually go to bed during the week

PropertyClockTime

TimingPt

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example unitsclock time

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

What time does your child usually go to bed during the weekClockTimePt^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.