Filter Function Assessment

Filter function assessment is the clinical evaluation of how effectively the kidneys remove waste and excess fluid from the blood while preserving essential substances. It typically combines measurements such as serum creatinine, estimated glomerular filtration rate, urine output, and urinary protein to assess glomerular filtration and detect impaired renal function. These results help identify kidney disease, characterize its severity, monitor changes over time, and guide medication decisions or other clinical interventions. In research and practice, repeated assessment supports early detection of dysfunction and improves evaluation of treatment response, particularly in patients at risk for acute or chronic kidney injury.

Filter Function Assessment - Related Videos

Research

JoVE Journal - Biology
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Evaluating the Effect of Coated Filters and Pre-Filters on the Infectivity and Concentration of Aerosolized Phi6 Virus

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2026

Here, we present a study to evaluate the anti-viral efficacy of copper- and silver-based surface coatings on air filters. Using a bioaerosol chamber and Phi6 bacteriophage, this method quantifies viral inactivation and mechanical filtration efficiency for self-sanitizing indoor air technologies.

Education

JoVE Core - Electrical Engineering

Passive Filters

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2024

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources. Low-Pass Filters Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...

A Dual-Functional Electroactive Filter Towards Simultaneously Sb(III) Oxidation and Sequestration

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Cited by 1 •

2019

A protocol for the rational design of a dual-functional electroactive filter consisting of carbon nanotubes and titanate nanowires is reported and their environmental applications towards Sb(III) oxidation and sequestration is presented.

Active Filters

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2025

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is: Where Af is the gain at low frequencies also known as the dc gain, s is the...

Non-invasive Assessment of Microvascular and Endothelial Function

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Cited by 12 •

2013

Capillaroscopy is a non-invasive, relatively inexpensive methodology for directly visualizing the microcirculation. The forearm blood flow technique provides accepted non-invasive measures of endothelial function.

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