Glycated hemoglobin (HbA1c)
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HbA1c as a Biomarker for Diabetes Diagnosis and Management
Glycated hemoglobin (HbA1c) is widely recognized as the gold standard for monitoring long-term blood glucose control in people with diabetes. It reflects the average blood glucose levels over the previous two to three months, corresponding to the lifespan of red blood cells, and is less affected by short-term fluctuations or external factors compared to direct glucose testing Jebur2024Su2024Zhan2022+1 MORE. This makes HbA1c a reliable tool for both diagnosing diabetes and tracking the effectiveness of treatment strategies Jebur2024Lippi2010.
Clinical Applications and Diagnostic Value of HbA1c
HbA1c is used not only for ongoing diabetes management but also for screening and diagnosing diabetes, including gestational diabetes mellitus (GDM). Studies show that HbA1c has high diagnostic accuracy for GDM, with strong sensitivity and specificity, making it a useful screening tool during pregnancy Jebur2024Younas2024Lippi2010. Additionally, HbA1c testing is recommended by major diabetes associations for nonpregnant individuals due to its convenience and ability to provide a comprehensive picture of glycemic control .
Advances in HbA1c Detection Technologies
Recent years have seen significant progress in the development of sensitive and specific methods for HbA1c detection. Techniques such as Raman spectroscopy and electrochemical sensors offer high accuracy, reproducibility, and the potential for high-throughput or point-of-care testing Barman2012Su2024Zhan2022. These technologies utilize nanomaterials and advanced probes to improve sensitivity and selectivity, making HbA1c testing more accessible and affordable for smaller clinics and laboratories Su2024Zhan2022.
Limitations and Influencing Factors in HbA1c Measurement
Despite its advantages, HbA1c measurement is not without limitations. Several non-glycemic factors can affect HbA1c results, including variations in red blood cell lifespan, hemoglobinopathies, and certain clinical conditions such as iron deficiency anemia, end-stage renal disease, and increased red blood cell turnover Jebur2024Reynolds2006Schnedl2001+2 MORE. Hemoglobin variants can interfere with some detection methods, leading to inaccurate results Schnedl2001Lippi2010. Additionally, repeat testing within less than 120 days or in situations that shorten red blood cell lifespan may not accurately reflect glycemic control .
Personalized and Virtual HbA1c Approaches
To address individual variability in HbA1c-glucose relationships, new concepts such as personalized HbA1c (pA1c) and computed “virtual” HbA1c have been proposed. These approaches consider differences in red blood cell properties and glucose uptake, aiming to provide more accurate and individualized assessments of glycemic exposure Leow2016Dunn2023. Such innovations could help reduce the risk of over- or under-treatment and improve diabetes management outcomes Leow2016Dunn2023.
Conclusion
HbA1c remains a cornerstone in diabetes diagnosis and management due to its ability to reflect long-term glycemic control. Advances in detection technologies and personalized approaches are enhancing its clinical utility. However, clinicians must be aware of the factors that can influence HbA1c results and interpret them in the context of each patient’s unique clinical situation.
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Glycated haemoglobin (HbA1c) monitoring
HbA1c testing should be repeated every 120 days for accurate diabetic control.
Emerging biosensor probes for glycated hemoglobin (HbA1c) detection
Emerging HbA1c biosensors offer affordable, readily available options for glycemic monitoring, utilizing nanomaterials and high-specificity probes for exceptional sensitivity and selectivity in detection.
Glycated hemoglobin (HbA1c): old dogmas, a new perspective?
HbA1c testing offers advantages over blood glucose for diagnosing and monitoring diabetes, but has limitations in pregnancy, elderly, and non-Hispanic blacks, and may be biased by hemoglobin variants.
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