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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
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Related Experiment Video

Updated: Jan 7, 2026

Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Xiaqing Jiang1, Tina D Hoang2, Leslie M Shaw3

  • 1University of California, San Francisco, San Francisco, CA, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
PubMed
Summary
This summary is machine-generated.

Alzheimer disease (AD) blood biomarkers like Aβ42/40, p-tau217, NfL, and GFAP are linked to cognitive function in midlife adults. Early AD pathology in midlife may impact cognitive decline, highlighting the importance of prevention strategies.

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Area of Science:

  • Neurology
  • Biomarker Research
  • Cognitive Science

Background:

  • Limited research exists on Alzheimer disease (AD) blood biomarkers in midlife populations.
  • Most studies focus on older adults, leaving a gap in understanding midlife cognitive associations.

Purpose of the Study:

  • To investigate the relationship between plasma AD biomarkers and cognitive function in a midlife cohort.
  • To explore associations between specific biomarkers (Aβ42/40, p-tau217, GFAP, NfL) and cognitive domains.

Main Methods:

  • Cross-sectional study of 1,356 dementia-free participants (mean age 61).
  • Assayed plasma Aβ42/40, p-tau217, GFAP, and NfL.
  • Used linear regression to assess biomarker associations with cognitive performance and potential race interactions.

Main Results:

  • Lower Aβ42/40 and higher p-tau217, NfL, and GFAP were associated with increased AD risk.
  • Lower Aβ42/40, higher p-tau217, and higher p-tau217/Aβ42 correlated with worse processing speed and executive function.
  • Higher NfL and GFAP were linked to deficits in multiple cognitive domains, independent of race.

Conclusions:

  • Blood biomarkers suggest AD pathology and neurodegeneration may begin impacting midlife cognition.
  • Midlife represents a critical window for AD prevention to potentially delay cognitive decline and dementia onset.