Version 2.78

Part Description

LP229992-5   Washout rate
The washout rate (WR) is a measure of how quickly a tracer is cleared. In cardiac nuclear imaging, the WR is calculated based on tracer uptake in early and delayed images. In one study of patients on multi-drug chemotherapy regimens, the washout rate for patients on chemotherapy was significantly higher compared to controls before any other clinical signs of cardiotoxicity were apparent. PMID: 23173103 Other studies have shown that patients with heart failure of varying etiologies also have a higher WR compared to controls, and an elevated WR may be an indicator for the risk of sudden cardiac death and fatal arrhythmias. However, patients who respond to treatment with beta blockers and/or renin-angiotensin-aldosterone inhibitors, as evidenced by improvement in NYHA functional class, have been found to have a decrease in WR on follow-up imaging studies. PMID: 26033897 Source: Regenstrief LOINC, PMID: 23173103

Fully-Specified Name

Component
Washout rate
Property
Ratio
Time
Pt
System
Myocardium
Scale
Qn
Method
NM.SPECT

Additional Names

Short Name
Washout Myocardium SPECT

Basic Attributes

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

Formula (Readable)

Washout rate = [(Initial counts - Delayed counts)/Initial counts]*100

Member of these Panels

LOINC Long Common Name
82654-5 Cardiac nuclear imaging SPECT panel

Language Variants Get Info

Tag Language Translation
es-MX Spanish (Mexico) Tasa de lavado:Proporción:Punto temporal:Miocardio:Cuantitativo:NM.SPECT
it-IT Italian (Italy) Washout, tasso:Rapporto:Pt:Miocardio:Qn:NM.SPECT
Synonyms: Procedure cardiache Punto nel tempo (episodio) SPECT Tasso di washout
zh-CN Chinese (China) 清除速率:比率:时间点:心肌:定量型:NM.SPECT
Synonyms: 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 时刻;随机;随意;瞬间 来自于不同体系的两个观察指标之比;比;比值 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 清除（洗出、冲洗、速生速降、洗脱）速率（速度、快慢） 速度

Example Units

Unit Source
% 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=82651-1