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Related Concept Videos

Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
Pharmacokinetic Models: Comparison and Selection Criterion01:26

Pharmacokinetic Models: Comparison and Selection Criterion

Physiological and compartmental models are valuable tools used in studying biological systems. These models rely on differential equations to maintain mass balance within the system, ensuring an accurate representation of the dynamic processes at play.
Physiological models take a detailed approach by considering specific molecular processes. They can predict drug distribution, metabolism, and elimination changes, providing a comprehensive understanding of how drugs interact with the body.
Analysis of Population Pharmacokinetic Data01:12

Analysis of Population Pharmacokinetic Data

Analysis of population pharmacokinetic data involves studying the behavior of drugs within diverse populations to understand their pharmacokinetic parameters. Traditional pharmacokinetic methods typically involve collecting samples from a few individuals and estimating these parameters. While these methods are commonly used, they have limitations in capturing the variability in drug response among individuals or heterogeneous populations. Population pharmacokinetics is employed to address these...
Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
Measurement of Bioavailability: Pharmacokinetic Methods01:30

Measurement of Bioavailability: Pharmacokinetic Methods

Pharmacokinetics is a vital branch of pharmacology that examines how drugs are absorbed, distributed, metabolized, and excreted by the body. Two key methodologies in pharmacokinetics are plasma drug concentration studies and urinary drug excretion analyses, both of which provide critical insights into a drug's therapeutic efficacy and bioavailability.Plasma Drug Concentration-Time StudiesPlasma drug concentration-time studies involve analyzing blood samples at specific intervals to quantify...

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Updated: Jun 6, 2026

An Intestine/Liver Microphysiological System for Drug Pharmacokinetic and Toxicological Assessment
08:59

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Published on: December 3, 2020

Criteria for selecting pharmacokinetic repeat study samples.

S Peter King1, Bruce J Aungst, Huey-Shin L Shen

  • 1QPS, LLC, 1 Innovation Way, Suite 200, Delaware Technology Park, Newark, DE 19711, USA. peter.king@questpharm.com

Bioanalysis
|November 19, 2010
PubMed
Summary
This summary is machine-generated.

Repeat bioanalysis is crucial for pharmacokinetically anomalous samples, ensuring data integrity in drug development. Standardized procedures prevent subjective selection and ensure reliable drug concentration analysis.

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High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
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High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry

Published on: April 23, 2019

Area of Science:

  • Pharmacokinetics
  • Bioanalytical Chemistry
  • Drug Development

Background:

  • Pharmacokinetic (PK) studies require accurate drug concentration measurements over time.
  • Anomalous plasma concentration versus time profiles can arise from various factors, including predose or placebo samples, or unusual peak patterns.
  • Ensuring the reliability of bioanalytical data is critical for drug efficacy and safety assessment.

Purpose of the Study:

  • To define the necessity and methodology for repeat bioanalysis of pharmacokinetically anomalous samples.
  • To differentiate the purpose and conduct of repeat analysis for anomalous samples versus incurred sample re-analysis (ISR).
  • To establish clear criteria for selecting and analyzing PK repeat samples to avoid subjectivity.

Main Methods:

  • Selection of PK repeat samples by the study pharmacokineticist based on incongruent concentration data.
  • Repeat bioanalysis conducted in duplicate or triplicate.
  • Development of standard operating procedures (SOPs) to define selection criteria and analysis procedures.

Main Results:

  • Pharmacokinetically anomalous samples require specific repeat bioanalysis, distinct from ISR.
  • Justification for selecting PK repeat samples must be clearly documented.
  • SOPs are essential for consistent and objective selection and analysis of PK repeat samples.

Conclusions:

  • Repeat bioanalysis of pharmacokinetically anomalous samples is a distinct and necessary process for ensuring data quality.
  • ISR assessments alone cannot validate or invalidate results from anomalous samples.
  • Standardized procedures are vital for the reliable assessment of drug plasma concentrations in nonclinical and clinical studies.