![Beckman Coulter UniCel DxC Synchron 600 Скачать руководство пользователя страница 173](http://html.mh-extra.com/html/beckman-coulter/unicel-dxc-synchron-600/unicel-dxc-synchron-600_instructions-for-use-manual_2719768173.webp)
Quality Control
Introduction
UniCel DxC Systems Instructions For Use A13914
Quality Control
October 2005
Page 6-1
6
CHAPTER 6 Quality Control
Quality Control
Introduction
This task is performed when your laboratory protocol indicates that control material
should be analyzed. A daily analysis of at least two levels of control materials is highly
recommended. In addition, these controls should be run with each new calibration,
with each new lot of reagents, and after specific maintenance or troubleshooting
activities. However, users should determine their own frequency based on the NCCLS
Proposed Guideline C24-P INTERNAL QUALITY CONTROL TESTING:
PRINCIPLES AND DEFINITIONS.
Quality Control Program
The system Quality Control program provides the capability of monitoring system and
chemistry performance by performing real-time analysis of control data.
The QC data is presented in both a summary format and in a chart format. Westgard
QC rules are applied to the data to aid in determining chemistry and system reliability.
Determination of QC Flags
The DxC uses the Z-score method for standardizing the scale of a normally distributed
measurement variable. For an individual control result, the Z-score represents the
distance in standard deviations from the assigned mean. The Z-score is calculated
from the following equation where:
Each time a control result is received, the Z-score is calculated. If the Z-score is less
than ± 2 SD, the result is within the assigned control range (the assigned mean ± 2
assigned standard deviations) and is considered acceptable.
Note: Results are flagged at time of run. Flagging is not changed if the operator
modifies the assigned mean and/or SD.
E014425L.EPS
Z =
X = the individual control result
X = the assigned mean for the control
SD = the assigned standard deviation for the control
SD
X - X