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 64794-1: In the 3 months before you got pregnant, how many cigarettes did you smoke on an average day [PhenX]

Name: LOINC Code 64794-1: In the 3 months before you got pregnant, how many cigarettes did you smoke on an average day [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:44.549Z

64794-1 is a LOINC code used to identify In the 3 months before you got pregnant, how many cigarettes did you smoke on an average day [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 In the 3Mo before you got pregnant, how many cigarettes did you smoke on an average D. 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 In the 3Mo before you got pregnant, how many cigarettes did you smoke on an average D. 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

In the 3 months before you got pregnant, how many cigarettes did you smoke on an average day [PhenX]
In the 3Mo before you got pregnant, how many cigarettes did you smoke on an average D
A pack has 20 cigarettes.
Cigarettes before preg per D; Count/time; Dextro; 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

In the 3 months before you got pregnant, how many cigarettes did you smoke on an average day [PhenX]Cigarettes before preg per D PhenXIn the 3Mo before you got pregnant, how many cigarettes did you smoke on an average DPHENXNRatPt^Patient

Frequently asked questions

Code details

Code64794-1

SystemLOINC

Display nameIn the 3 months before you got pregnant, how many cigarettes did you smoke on an average day [PhenX]

DescriptionIn the 3Mo before you got pregnant, how many cigarettes did you smoke on an average D

Short nameCigarettes before preg per D PhenX

ComponentIn the 3Mo before you got pregnant, how many cigarettes did you smoke on an average D

PropertyNRat

TimingPt

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example units#/day

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

In the 3Mo before you got pregnant, how many cigarettes did you smoke on an average DNRatPt^PatientQnPhenXIn the 3 months before you got pregnant, how many cigarettes did you smoke on an average dayNumber 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.