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Part Description

LP229994-1   Summed rest score
The summed rest score (SRS), summed stress score (SSS) and summed difference score (SDS) are variables used to measure cardiac perfusion and ischemia on cardiac SPECT studies. The SRS and SSS are calculated during the rest and stress parts of the study, respectively, and the SDS is the difference between the two.
A five-point scoring system is used to assign a perfusion value to each of the 17 or 20 myocardial segments (depending on which segmentation model is used), each of which corresponds to a coronary artery segment territory, as follows: 0 = normal tracer uptake; 1 = equivocal tracer uptake; 2 = moderate reduction in uptake; 3 = severe reduction of uptake; and 4 = absence of detectable tracer uptake. The values for all of the segments are summed, giving a total possible SRS and SSS of 68 for the 17-segment model and 80 for the 20-segment model. The sum of the differences between the score at rest and score with stress for each segment is the SDS, which represents the amount of ischemia.
The SRS, SSS and SDS can be converted to a percent of the total myocardium involved with stress, ischemic, or fixed defects by dividing the summed scores by either 68 or 80 (the maximum possible score for the 17 and 20-segment model, respectively), and multiplying by 100.
PMID: 12771008 Source: Regenstrief LOINC, PMID: 12771008

LOINC Names Get Info

Fully-Specified Name
Summed rest score:Prctl:Pt:Myocardium:Qn:NM.SPECT
Long Common Name
Summed rest score Myocardium SPECT
Short Name
SRS Myocardium SPECT

Part Model Get Info

  • Component
    Summed rest score
    LP229994-1
    • Analyte
      Summed rest score
      LP229994-1
      • Component Numerator
        Summed rest score
        LP229994-1
        • Component Numerator Core
          Summed rest score
          LP229994-1
        • Component Numerator Core Suffix
          NULL
           
      • Component Denominator
        NULL
         
        • Component Denominator Core
          NULL
           
        • Component Denominator Core Suffix
          NULL
           
    • Challenge
      NULL
       
    • Adjustment
      NULL
       
    • Count
      NULL
       
  • Property
    Prctl
    LP6846-2
  • Time
    Pt
    LP6960-1
  • System
    Myocardium
    LP101987-8
  • Scale
    Qn
    LP7753-9
  • Method
    NM.SPECT
    LP208656-1

Basic Attributes

Class
CARD.PROC
Type
Clinical
First Released
Version 2.58
Last Updated
Version 2.58 (ADD)
Order vs. Observation
Observation

Formula (Readable)

Summed rest score percentile = [Summed rest score/(4*Number of segments)]*100

Member of these Panels

LOINCLong Common Name
82654-5Cardiac nuclear imaging SPECT panel

Language Variants Get Info

TagLanguageTranslation
el-GRGreek (Greece)Συνολική βαθμολογία ηρεμίας:Prctl:Pt:Μυοκάρδιο:Qn:NM.SPECT
Synonyms: CARD.PROC NM NM.SPECT Prctl Pt Qn Βαθμολογία Μυοκάρδιο Συνολική βαθμολογία ηρεμίας
es-MXSpanish (Mexico)Puntuación de descanso sumada:Prctl:Punto temporal:Miocardio:Cuantitativo:NM.SPECT
it-ITItalian (Italy)Punteggio sommato delle immagini a riposo:Prctl:Pt:Miocardio:Qn:NM.SPECT
Synonyms: Percentile Procedure cardiache Punto nel tempo (episodio) SPECT
zh-CNChinese (China)总静息评分:百分位数:时间点:心肌:定量型:NM.SPECT
Synonyms: 分值;分数;得分 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 心肌特异性;心肌的 心脏病学 总静息（静息灌注）评分（分值、得分、分数）;总静息评分;总和静息分数;静息灌注总评分（总分数、总得分、总分值、总分）;summed rest score;SRS 时刻;随机;随意;瞬间 核医学方法;核医学设备;nuclear medicine 核医学方法;核医学设备;nuclear medicine;单光子发射计算机断层扫描;single photon emission computed tomography;SPECT;单光子发射计算机断层显像;单光子发射断层扫描;发射计算机断层术;放射性核素扫描;同位素发射计算机辅助断层显像;Emission Computed tomography;ECT 百分位

Example Units

UnitSource
%Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=82649-5