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 65591-0: During the past Y, what was the longest period of time that you had these sleeping problems on most nights [PhenX]

Name: LOINC Code 65591-0: During the past Y, what was the longest period of time that you had these sleeping problems on most nights [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:45.456Z

65591-0 is a LOINC code used to identify During the past Y, what was the longest period of time that you had these sleeping problems on most nights [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 During the past Y, what was the longest period of time that you had these sleeping problems on most nights. 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 past Y, what was the longest period of time that you had these sleeping problems on most nights. 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

During the past Y, what was the longest period of time that you had these sleeping problems on most nights [PhenX]
During the past Y, what was the longest period of time that you had these sleeping problems on most nights
Last; Last Y longest period; QNT; Quan; Quant; Quantitative

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 past Y, what was the longest period of time that you had these sleeping problems on most nights [PhenX]Last Y longest period PhenXDuring the past Y, what was the longest period of time that you had these sleeping problems on most nightsPHENXTime1Y^Patient

Frequently asked questions

Code details

Code65591-0

SystemLOINC

Display nameDuring the past Y, what was the longest period of time that you had these sleeping problems on most nights [PhenX]

DescriptionDuring the past Y, what was the longest period of time that you had these sleeping problems on most nights

Short nameLast Y longest period PhenX

ComponentDuring the past Y, what was the longest period of time that you had these sleeping problems on most nights

PropertyTime

Timing1Y

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example unitswk; mo; year

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

During the past Y, what was the longest period of time that you had these sleeping problems on most nightsTime1Y^PatientQnPhenXTime (e.g. seconds)1 year

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.