Ionized Calcium Analysis
Ionized Calcium Analysis - Related Videos
03:12
Ionization Energy
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2020
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge: The energy required to remove the second most loosely bound electron is called the second ionization energy (IE2). The energy required to remove the third electron is the third ionization energy, and so on. Energy is always required...
02:38
Analysis of Calcium Dynamics and Membrane Potential Changes in a Mouse Arteriolar Endothelium
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2025
Source: Hakim, M. A. et al., Isolation and Functional Analysis of Arteriolar Endothelium of Mouse Brain Parenchyma. J. Vis. Exp. (2022).This video demonstrates the functional analysis of an arteriolar endothelial tube isolated from a mouse brain. It outlines the steps for measuring intracellular calcium levels and membrane potential, both at baseline and in response to pharmacological stimulation.
12:19
Single-channel Analysis and Calcium Imaging in the Podocytes of the Freshly Isolated Glomeruli
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Cited by 25 •
2015
Changes in the intracellular calcium levels in the podocytes are one of the most important means to control the filtration function of glomeruli. Here we explain a high-throughput approach that allows detection of real-time calcium handling and single ion channels activity in the podocytes of the freshly isolated glomeruli.
09:22
Gas Chromatography (GC) with Flame-Ionization Detection
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Gas chromatography (GC) is used to separate and detect small molecular weight compounds in the gas phase. The sample is either a gas or a liquid that is vaporized in the injection port. Typically, the compounds analyzed are less than 1,000 Da, because it is difficult to vaporize larger compounds. GC is popular for environmental monitoring and industrial applications because it is very reliable and can be run nearly continuously.
08:43
Calcium Imaging in Neurons
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2023
Calcium ions play an integral role in neuron function: They act as intracellular signals that can elicit responses such as altered gene expression and neurotransmitter release from synaptic vesicles. Within the cell, calcium concentration is highly dynamic due to the presence of pumps that selectively transport these ions in response to a variety of signals. Calcium imaging takes advantage of intracellular calcium flux to directly visualize calcium signaling in living neurons.This video begins...
FAQs
pH changes how calcium binds to proteins in blood, altering the proportion that remains free and biologically available. Consequently, a measured ionized calcium value can reflect clinically important calcium disturbances even when total calcium does not fully represent calcium availability. Considering pH alongside the result is essential when assessing calcium-related neuromuscular, cardiac, and cellular function.
Total calcium includes calcium associated with proteins as well as the free fraction, whereas ionized calcium analysis focuses on the fraction available for physiologic activity. When albumin levels are abnormal, total calcium may not accurately indicate biologically available calcium. The ionized measurement can therefore provide more direct information for evaluating suspected calcium imbalance.
The ion-selective electrode detects calcium ions in the blood sample and converts their presence into a measurement of the ionized fraction. This approach targets free calcium rather than estimating availability from related blood components. Its value is greatest when binding conditions, including pH or albumin status, make indirect interpretation of total calcium less reliable.
It is especially useful when clinicians need to evaluate hypocalcemia or hypercalcemia in settings where calcium regulation or binding may be disturbed. Important contexts include critical illness, kidney disease, and disorders of parathyroid regulation. In these situations, the result helps characterize calcium availability for functions involving nerves, muscles, the heart, and other cells.
A blood sample is obtained and analyzed with an ion-selective electrode that detects calcium ions. Interpretation should account for pH because acid-base conditions can change calcium binding to proteins. This workflow produces a direct assessment of the free fraction, allowing clinicians to examine calcium availability without relying solely on total calcium or albumin-related interpretation.
The measurement can support assessment of disorders of parathyroid regulation and kidney disease by showing whether the biologically active calcium fraction is disturbed. It also contributes to evaluation and management of hypocalcemia and hypercalcemia. Because the result reflects free calcium, it can clarify clinically important abnormalities that may be obscured when protein levels or acid-base status are abnormal.