In Vivo Testing
In Vivo Testing - Related Videos
09:16
Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System
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Cited by 36 •
2015
Ex vivo ERG can be used to record electrical activity of retinal cells directly from isolated intact retinas of animals or humans. We demonstrate here how common in vivo ERG systems can be adapted for ex vivo ERG recordings in order to dissect the electrical activity of retinal cells.
12:03
In Vivo Model for Testing Effect of Hypoxia on Tumor Metastasis
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Cited by 6 •
2016
This manuscript describes the development of an animal model that allows for the direct testing of the effects of tumor hypoxia on metastasis and the deciphering the mechanisms of its action. Although the experiments described here focus on Ewing sarcoma, a similar approach can be applied to other tumor types.
11:38
Environmentally-controlled Microtensile Testing of Mechanically-adaptive Polymer Nanocomposites for ex vivo Characterization
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Cited by 9 •
2013
A method is discussed by which the in vivo mechanical behavior of stimuli-responsive materials is monitored as a function of time. Samples are tested ex vivo using a microtensile tester with environmental controls to simulate the physiological environment. This work further promotes understanding the in vivo behavior of our material.
04:56
In Vivo Electrophysiological Measurement of the Rat Ulnar Nerve with Axonal Excitability Testing
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Cited by 3 •
2018
Axonal excitability techniques provide a powerful tool to examine pathophysiology and biophysical changes that precede irreversible degenerative events. This manuscript demonstrates the use of these techniques on the ulnar nerve of anesthetized rats.
10:32
Hippocampal Insulin Microinjection and In vivo Microdialysis During Spatial Memory Testing
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Cited by 14 •
2013
Modulation of hippocampally-dependent spatial working memory by direct intrahippocampal microinjection, accompanied and followed by in vivo microdialysis for metabolites in conscious, behaving animals.
FAQs
Living organisms preserve coordinated physiological interactions that are absent from cell cultures or isolated tissues. These interactions can shape responses to a compound, altered biological condition, or experimental procedure across multiple levels, including behavior, tissues, biomarkers, and survival. Consequently, findings may reveal effects that isolated systems cannot capture, while also introducing greater biological variability.
Controls help distinguish effects caused by the tested intervention from changes associated with experimental conditions. Monitoring provides a way to track physiological or biological responses during the study and identify variation that could influence interpretation. Together, these practices strengthen comparisons between groups, support more reliable conclusions, and help researchers address welfare considerations during the experiment.
In vivo testing can evaluate several complementary outcomes rather than relying on a single measurement. Researchers may assess behavior, tissue changes, biomarker levels, or survival, depending on the biological question. Combining these readouts can connect an observable response with underlying biological changes and help determine whether an intervention produces a beneficial, harmful, or disease-related effect.
A study generally begins by selecting the biological condition or intervention to examine, followed by administering a compound, altering a condition, or introducing an experimental procedure. Researchers then maintain appropriate controls and monitor the organism throughout the study. Measurements such as behavior, tissue changes, biomarker levels, or survival provide the evidence used to evaluate the response.
The method becomes especially informative when the research question depends on interactions among physiological systems that cell cultures or isolated tissues cannot preserve. It can extend earlier findings by showing how a treatment or condition affects an intact organism. This broader context is important when evaluating drug efficacy, toxicity, disease mechanisms, or therapeutic responses before translational conclusions are drawn.
In vivo findings provide evidence about whether an intervention produces measurable effects within a living biological context, helping connect experimental biology with potential therapeutic evaluation. Studies may address drug efficacy, toxicity, disease mechanisms, or responses to treatment. Their translational value depends on careful design, appropriate controls, monitoring, attention to variability, and ethical oversight, including animal-welfare considerations where relevant.