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Related Concept Videos

Drug Concentrations: Measurements01:23

Drug Concentrations: Measurements

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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...
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Drug toxicity: Idiosyncratic Reactions01:16

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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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Therapeutic Drug Monitoring: Drug Analysis Methods01:26

Therapeutic Drug Monitoring: Drug Analysis Methods

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Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood or body tissues to tailor drug therapy effectively. This monitoring is critical for managing drugs with narrow therapeutic indices like digoxin and phenytoin, ensuring they are both safe and effective. For instance, monitoring theophylline levels in asthma patients involves precision and sensitivity to adjust doses according to individual responses to therapy, ensuring efficacy and...
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Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

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In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess...
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Drug Excretion: Miscellaneous Routes01:10

Drug Excretion: Miscellaneous Routes

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Drug excretion involves various organs, including the liver, intestines, skin, and eyes. In the case of drugs or toxins, they can be actively secreted into bile by transporters in the hepatocyte's canalicular membrane. These substances enter the GI tract during digestion and may be reabsorbed into the body from the intestine. This process, known as enterohepatic recycling, can significantly prolong the presence and effects of a substance in the body. To interrupt this cycle, specific...
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Drug Binding to Blood Components01:30

Drug Binding to Blood Components

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When drugs enter systemic circulation, they interact with various components of the blood, including proteins such as human serum albumin (HSA), α1-acid glycoprotein (AAG), lipoproteins, globulins, and red blood cells (RBCs).
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Related Experiment Video

Updated: Apr 5, 2026

Validated LC-MS/MS Panel for Quantifying 11 Drug-Resistant TB Medications in Small Hair Samples
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Hair Testing for Drugs - Challenges for Interpretation.

P R Stout1

  • 1Center for Forensic Sciences, RTI International, Research Triangle Park, NC, USA.

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|August 7, 2015
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Summary

Hair drug testing faces interpretation challenges due to environmental contamination and variable drug deposition. Reproducible results linking hair drug levels to actual ingestion remain difficult to obtain.

Keywords:
Cosmetic treatmentexternal contaminationhair testingmelanin content

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry
  • Pharmacology

Background:

  • Hair drug testing is increasingly utilized but presents significant interpretation challenges.
  • Environmental contamination is a primary concern, potentially yielding false positives for drug use.

Purpose of the Study:

  • To highlight the complexities and limitations in interpreting hair drug test results.
  • To emphasize the need for understanding drug deposition and decontamination mechanisms in hair.

Main Methods:

  • Review of existing literature on drug binding to hair, environmental contamination, and analytical variations.
  • Discussion of factors influencing drug incorporation and detection in hair samples.

Main Results:

  • Environmental contamination can lead to results indicative of drug use.
  • Melanin content, cosmetic treatments, and hair growth patterns complicate interpretation.
  • High analytical variation exists across different testing methods and proficiency systems.

Conclusions:

  • Current hair drug testing methods struggle to provide reproducible results unequivocally linked to drug ingestion.
  • Further research into drug deposition and retention mechanisms is crucial for accurate interpretation and to confirm absence of drug use.