Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
Plasma — a component of blood — is commonly used for pharmacokinetic studies. The total plasma concentration comprises unbound drugs and those bound to proteins in circulation. The filtered plasma's unbound drug concentration signifies the target site's concentration.
Tissue biopsies confirm if a drug has reached the target tissue at the necessary concentration. Urine analysis indirectly verifies the drug's bioavailability, reflecting the systemic absorption rate. Fecal measurements reveal unabsorbed oral doses or drugs expelled via bile.
In forensics, examining drug levels in autopsy tissues or bodily fluids can provide potential causes of death, such as overdose, poisoning, or drug abuse. As a result, measuring drug concentration is crucial for clinical and forensic applications, offering significant insights into drug efficacy, safety, and misuse.
Drug concentration represents the drug amount present in a biological sample. It helps assess the initial drug pharmacokinetics in the body.
The samples can be obtained either invasively or non-invasively. Invasive approaches involve parenteral or surgical interventions to collect blood, cerebrospinal fluid, or tissue biopsy. Non-invasive techniques provide samples such as urine, feces, and saliva.
Plasma, a blood component, is frequently used in drug pharmacokinetics studies. Unbound or protein-bound drugs in the circulation account for total plasma concentration. The unbound drug concentration in filtered plasma represents the concentration at the target site.
Tissue biopsies verify whether a drug reaches the target tissue at the desired concentration.
Urine analysis indirectly confirms the drug's bioavailability, reflecting systemic absorption rate, while fecal measurements indicate unabsorbed oral doses or drugs expelled via the bile.
Examining drug levels in autopsy tissues or bodily fluids provides potential causes of death, such as overdose, poisoning, or drug abuse.
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