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Is there an HbA1c Threshold for Symptoms of Chronic Hyperglycemia?

Nicolle Müller1, Thomas Lehmann2, Ulrich Alfons Müller3

  • 1Department for Internal Medicine III, Jena University Hospital, Jena, Germany.

Experimental and Clinical Endocrinology & Diabetes : Official Journal, German Society of Endocrinology [And] German Diabetes Association
|June 8, 2021
PubMed

Insights

Researchers identified specific HbA1c levels that indicate when most people with diabetes experience hyperglycemia symptoms. Maintaining a safety margin below these thresholds is crucial for patient well-being.

Area of Science:

  • Endocrinology
  • Metabolic Disorders
  • Diabetes Mellitus Research

Background:

  • The primary goal in diabetes management is to prevent hyperglycemia symptoms.
  • Defining a precise HbA1c (hemoglobin A1c) threshold for symptom onset remains challenging.

Purpose of the Study:

  • To establish an HbA1c level above which most individuals with diabetes report symptoms of hyperglycemia.
  • To inform clinical practice regarding symptom management and treatment adjustments.

Main Methods:

  • A multicenter, cross-sectional study involving 137 type 1 and 285 type 2 diabetes patients.
  • Utilized a standardized questionnaire to assess 17 hyperglycemia symptoms, summarized into a Total Hyperglycemia Symptom Score (THSS).
  • Collected data on symptom frequency and intensity over the preceding 4-6 weeks.

Main Results:

  • Identified an HbA1c threshold of 10.05% for type 1 diabetes and 8.9% for type 2 diabetes, above which most patients experienced symptoms.
  • Frequent urination and tiredness were key indicators of hyperglycemia.
  • A positive correlation was observed between THSS, age, and HbA1c levels (r=0.254; p<0.001).

Conclusions:

  • An HbA1c threshold predicting hyperglycemia symptoms has been identified for both type 1 and type 2 diabetes.
  • Maintaining a therapeutic safety margin below these thresholds is recommended to ensure patient comfort.
  • Therapy adjustments should consider both HbA1c values and reported hyperglycemia symptoms due to multifactorial influences.
Abstract

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