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 64445-0: Over the past 3 months, in an average week, how many good days, with little chest trouble, have you had [PhenX]

Name: LOINC Code 64445-0: Over the past 3 months, in an average week, how many good days, with little chest trouble, have you had [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:43.951Z

64445-0 is a LOINC code used to identify Over the past 3 months, in an average week, how many good days, with little chest trouble, have you had [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 Over the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you had. 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 Over the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you had. 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

Over the past 3 months, in an average week, how many good days, with little chest trouble, have you had [PhenX]
Over the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you had
3 months; Count/time; Good Ds in W; Last; nRate; Number rate; Number Rate = Count/Time; 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

Over the past 3 months, in an average week, how many good days, with little chest trouble, have you had [PhenX]Good Ds in W PhenXOver the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you hadPHENXNRat3Mo^Patient

Frequently asked questions

Code details

Code64445-0

SystemLOINC

Display nameOver the past 3 months, in an average week, how many good days, with little chest trouble, have you had [PhenX]

DescriptionOver the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you had

Short nameGood Ds in W PhenX

ComponentOver the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you had

PropertyNRat

Timing3Mo

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example unitsdays/week

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

Over the past 3Mo, in an average W, how many good Ds, with little chest trouble, have you hadNRat3Mo^PatientQnPhenXOver the past 3 months, in an average week, how many good days, with little chest trouble, have you hadNumber Rate3 months

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.