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 64590-3: How often does your child use recreational drugs [PhenX]

Name: LOINC Code 64590-3: How often does your child use recreational drugs [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:43.951Z

64590-3 is a LOINC code used to identify How often does your child use recreational drugs [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 often does your child use recreational drugs. 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 often does your child use recreational drugs. 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 often does your child use recreational drugs [PhenX]
How often does your child use recreational drugs
Child recreat drug freq; Count/time; Drug; nRate; Number rate; Number Rate = Count/Time; Point in time; QNT; Quan; Quant; Quantitative; Random

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 often does your child use recreational drugs [PhenX]Child recreat drug freq nRate PhenXHow often does your child use recreational drugsPHENXNRatPt^Patient

Frequently asked questions

Code details

Code64590-3

SystemLOINC

Display nameHow often does your child use recreational drugs [PhenX]

DescriptionHow often does your child use recreational drugs

Short nameChild recreat drug freq nRate PhenX

ComponentHow often does your child use recreational drugs

PropertyNRat

TimingPt

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

How often does your child use recreational drugsNRatPt^PatientQnPhenXNumber RatePoint 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.