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Related Concept Videos

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

350
In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
350
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

375
Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
375
Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
392
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

271
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...
271
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

240
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,...
240
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism

383
Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
383

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Related Experiment Video

Updated: Apr 24, 2026

Ferritinophagy: Assessing the Selective Degradation of Iron by Autophagy in Human Fibroblasts
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Reassessing Ferritin Levels in Healthy Older Adults: Updated Reference Ranges and Associated Health Outcomes.

Sultana Monira Hussain, John K Olynyk, Hans G Schneider

    Archives of Pathology & Laboratory Medicine
    |April 22, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study established ferritin reference ranges for older adults, finding low ferritin levels in men are linked to higher risks of gastrointestinal bleeding and cancer.

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    Area of Science:

    • Gerontology
    • Clinical Chemistry
    • Biomarkers

    Background:

    • Ferritin is a key biomarker for iron storage, but its reference ranges can vary significantly across different populations.
    • Establishing accurate ferritin reference ranges in older adults is crucial for interpreting iron status and associated health risks.

    Purpose of the Study:

    • To define sex-specific ferritin reference ranges in adults aged 70 years and older.
    • To investigate the association between ferritin levels and various health outcomes, including mortality, cardiovascular disease (CVD), and serious hemorrhage.

    Main Methods:

    • A post hoc analysis of 11,322 participants (5247 men, 6075 women) aged 70+ from the Aspirin in Reducing Events in the Elderly trial.
    • Ferritin levels were measured using the Abbott Alinity platform and analyzed in quintiles.
    • Longitudinal data on mortality, CVD morbidity, and hemorrhage were linked to baseline ferritin levels.

    Main Results:

    • Sex-specific ferritin reference ranges (2.5th-97.5th percentiles) were determined as 23-741 μg/L for men and 19-440 μg/L for women.
    • No significant associations were found between ferritin levels and disability-free survival, overall mortality, or CVD outcomes.
    • Men with the lowest ferritin levels exhibited increased risks of major hemorrhage, gastrointestinal (GI) bleeding, and GI cancer.

    Conclusions:

    • Suggested ferritin reference ranges for older adults (Abbott Alinity platform) are 25-740 μg/L for men and 20-440 μg/L for women.
    • Low ferritin levels in older men are associated with elevated risks for GI bleeding and GI cancer, highlighting potential clinical implications.