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 58313-8: Frequency (number in past year) of chest discomfort

Name: LOINC Code 58313-8: Frequency (number in past year) of chest discomfort
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:39.273Z

58313-8 is a LOINC code used to identify Frequency (number in past year) of chest discomfort 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 Frequency (number in past year) of chest discomfort. 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 Frequency (number in past year) of chest discomfort. 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

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Frequency (number in past year) of chest discomfort
Count/time; Freq (past year) of chest discomf; Last; No; nRate; Num; Number rate; Number Rate = Count/Time; PhenX; 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

Frequency (number in past year) of chest discomfortFreq (past year) of chest discomfPHENXNRatPt^PatientQn

Frequently asked questions

Code details

Code58313-8

SystemLOINC

Display nameFrequency (number in past year) of chest discomfort

Short nameFreq (past year) of chest discomf

ComponentFrequency (number in past year) of chest discomfort

PropertyNRat

TimingPt

System (specimen)^Patient

ScaleQn

ClassPHENX

Example units#/year

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.30

Last changed2.65

Part names

Frequency (number in past year) of chest discomfortNRatPt^PatientQnNumber 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.