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 66151-2: On the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or month [PhenX]

Name: LOINC Code 66151-2: On the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or month [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:45.459Z

66151-2 is a LOINC code used to identify On the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or month [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 On the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or Mo. 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 On the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or Mo. 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

On the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or month [PhenX]
On the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or Mo
14 days; 2 weeks; Avg number pills prescription; Count/time; Dextro; month; nRate; Number rate; Number Rate = Count/Time; Past; 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

On the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or month [PhenX]Avg number pills prescription PhenXOn the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or MoPHENXNRat2W^Patient

Frequently asked questions

Code details

Code66151-2

SystemLOINC

Display nameOn the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or month [PhenX]

DescriptionOn the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or Mo

Short nameAvg number pills prescription PhenX

ComponentOn the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or Mo

PropertyNRat

Timing2W

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example units#/d; #/wk; #/mo

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

On the average during the last 2W, how many of these pills, or medication items, did you take a D, W, or MoNRat2W^PatientQnPhenXOn the average during the last 2 weeks, how many of these pills, or medication items, did you take a day, week, or monthNumber Rate2 weeks

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.