Clearance Calculation
Clearance Calculation - Related Videos
01:09
Hepatic Drug Clearance: Restrictive and Nonrestrictive Clearance
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2025
Hepatic clearance refers to the volume of blood cleared of a drug by the liver per unit of time. It plays a crucial role in drug metabolism and elimination. While hepatic clearance is commonly estimated by subtracting renal clearance from total body clearance, other pathways, such as pulmonary or biliary clearance, may also contribute. However, these pathways are generally less significant than hepatic and renal clearance. Most drugs undergo restrictive clearance, which is proportional to the...
02:46
Calculating the Equilibrium Constant
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2020
The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression. For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation: When 0.10 mol NO2 is added to a 1.0-L flask at 25 °C, the concentration changes so that at equilibrium, [NO2] = 0.016 M and [N2O4] = 0.042 M. The value of the...
04:10
Analyzing the Glutamate Release and Clearance at a Single Neuron Synapse in a Mouse Brain Slice
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2025
This video demonstrates evaluating glutamate release and clearance at single corticostriatal synapses in a mouse brain slice. Electrical stimulation facilitates glutamate release at the synapse. The released glutamate alters sensor protein's fluorescence, which decays over time, indicating release and clearance efficiency.
08:59
Live Imaging of Apoptotic Cell Clearance during Drosophila Embryogenesis
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Cited by 10 •
2013
Here we describe an effective method for studying dynamics of apoptotic cell clearance in vivo. This method employs live Drosophila embryos as a powerful model for monitoring phagocytosis of apoptotic cells using specific labeling of apoptotic cells and phagocytes.
02:49
Calculating Standard Free Energy Changes
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2020
The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
FAQs
The calculation links how quickly a substance leaves the body with how much remains in circulating plasma. Dividing elimination rate by drug concentration produces an estimate of removal efficiency at the measured concentration. Because the result depends on both values, interpreting clearance requires attention to the concentration and elimination information used, rather than treating the estimate as an isolated number.
Total clearance combines removal through several pathways, including renal excretion, hepatic metabolism, and other routes. Separating these contributions helps clarify which physiological processes influence overall drug elimination. This distinction is clinically relevant when kidney or liver function changes, because the resulting alteration in one component can affect total clearance, drug exposure, accumulation, and potential toxicity.
A change in kidney or liver function can modify the corresponding contribution to total clearance. If overall removal changes, the body may experience different drug exposure or accumulation than expected from the original estimate. Clinicians therefore use clearance information alongside organ-function changes to reconsider dose size, dosing intervals, and the interpretation of measured drug concentrations.
The calculation requires an elimination rate and a drug concentration measured in circulating plasma. Dividing the elimination rate by the concentration yields the clearance estimate. After obtaining it, clinicians can relate the result to the drug’s renal, hepatic, or other removal pathways and use that information when evaluating dosing, concentration results, or changes in organ function.
Clearance estimates help clinicians select both how much drug to administer and how frequently to administer it. The goal is to account for how efficiently the body removes the substance, while recognizing that altered kidney or liver function may change that efficiency. These decisions can help manage expected exposure and reduce the risk of accumulation or toxicity.
In therapeutic drug monitoring, clearance estimates help clinicians interpret measured drug concentrations in relation to elimination from the body. The information supports assessment of exposure and accumulation and can indicate when treatment may require adjustment. This is especially useful when kidney or liver function changes, because altered clearance may affect whether observed concentrations remain clinically appropriate.