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Related Experiment Video

Updated: May 31, 2026

Cytosolic Calcium Measurements in Renal Epithelial Cells by Flow Cytometry

Cytosolic Calcium Measurements in Renal Epithelial Cells by Flow Cytometry

Published on: October 28, 2014

Linearity study of blood calcium test.

Qi Zhou¹, Jianping Xu, Wei Xie

¹Beijing Hospital, National Center for Clinical Laboratories, China. zhouqi89@hotmail.com

Clinical Laboratory

|July 16, 2011

Summary

This study evaluated laboratory blood calcium testing linearity using new EP6-A protocols. Most labs demonstrated good performance, indicating reliable clinical testing capabilities.

Area of Science:

Clinical Chemistry
Laboratory Medicine
Analytical Chemistry

Background:

Newly approved EP6-A protocol and Dr. Kroll's extended methods assess laboratory linearity.
Linearity surveys are crucial for evaluating clinical laboratory performance and enhancing test quality.

Purpose of the Study:

To evaluate the linearity of blood calcium testing across different analytical instruments.
To assess laboratory performance based on the EP6-A linearity assessment guidelines.

Main Methods:

Blood calcium data from 172 laboratories were analyzed using Olympus, Hitachi, Beckman CX, and Beckman LX instruments.
Polynomial regression analysis assessed statistical linearity/nonlinearity per Clinical and Laboratory Standards Institute EP6-A.
Dr. Kroll's EP6-A extended methods determined analytical imprecision and nonlinearity extents.

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A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro

A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro

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Last Updated: May 31, 2026

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Real-Time Measurements of Calcium and Contractility Parameters in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes

Published on: May 26, 2023

A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro

A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro

Published on: June 2, 2022

Main Results:

Imprecision varied by instrument, with two labs exceeding limits; most met linearity criteria (98.6%-100%).
Average deviations from linearity ranged from 0% to 3.92% across instrument groups.
Statistically significant linearity ranged from 3.6% to 43.9%, while clinical significance ranged from 54.4% to 96.4%.

Conclusions:

The majority of participating laboratories demonstrated good capability in blood calcium testing.
The EP6-A protocol and extended methods provide a robust framework for assessing laboratory linearity.
Results suggest high reliability for current blood calcium testing methods in clinical settings.