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 64535-8: How long does it take your child to fall asleep at night [PhenX]

Name: LOINC Code 64535-8: How long does it take your child to fall asleep at night [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:43.951Z

64535-8 is a LOINC code used to identify How long does it take your child to fall asleep at night [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 How long does it take your child to fall asleep at night. 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 How long does it take your child to fall asleep at night. 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

How long does it take your child to fall asleep at night [PhenX]
How long does it take your child to fall asleep at night
Child time fall asleep; Finding; Findings; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen

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

How long does it take your child to fall asleep at night [PhenX]Child time fall asleep PhenXHow long does it take your child to fall asleep at nightPHENXFindPt^Patient

Frequently asked questions

Code details

Code64535-8

SystemLOINC

Display nameHow long does it take your child to fall asleep at night [PhenX]

DescriptionHow long does it take your child to fall asleep at night

Short nameChild time fall asleep PhenX

ComponentHow long does it take your child to fall asleep at night

PropertyFind

TimingPt

System (specimen)^Patient

ScaleOrd

MethodPhenX

ClassPHENX

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

How long does it take your child to fall asleep at nightFindPt^PatientOrdPhenXFindingPoint 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.