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Can HbA1c Alone Be Safely Used to Guide Insulin Therapy in African Youth with Type 1 Diabetes?
Thereza Piloya-Were1, Lucy W Mungai2, Antoinette Moran3
1Department of Pediatrics, Makerere University College of Health Sciences, Kampala, Uganda.
Insights
Non-African HbA1c references overestimate mean blood glucose (MBG) in East African youth with type 1 diabetes. This finding highlights risks for hypoglycemia in African patients due to inaccurate diabetes management guidance.
Area of Science:
- Endocrinology
- Diabetes Mellitus Research
- Clinical Biochemistry
Background:
- Glycemic control in diabetes management relies on HbA1c and mean blood glucose (MBG).
- Ethnic variations in the HbA1c-MBG relationship can impact diabetes care accuracy.
- Limited glucose data in African populations necessitates understanding ethnic-specific glycemic markers.
Purpose of the Study:
- To assess if non-African reference data accurately estimate MBG from HbA1c in East African type 1 diabetes patients.
- To determine the potential for overestimation of MBG using established non-African references.
Main Methods:
- Compared continuous glucose monitoring (CGM) data from East African youth (Kenya, Uganda) with non-African cohorts (USA).
- Examined HbA1c versus MBG relationships using established A1c-derived average glucose (ADAG) and glucose management indicator (GMI) studies.
- Utilized a White European heritage cohort in New Orleans as an additional reference.
Main Results:
- Developed a specific regression equation for East African patients: MBG = 32.0 + 16.73 × HbA1c (r=0.55, p<0.0001).
- Non-African references significantly overestimated MBG for East African patients (e.g., HbA1c 9% estimated MBG 183 mg/dL vs. 212-249 mg/dL).
- Reported 21% incidence of serious hypoglycemia in the year prior among African patients.
Conclusions:
- Non-African reference data lead to substantial overestimation of MBG in East African patients.
- This overestimation poses a significant risk of hypoglycemia for African patients relying on HbA1c targets without local glucose data.
- Emphasizes the need for ethnic-specific reference data for accurate diabetes management in diverse populations.
Introduction:
The relationship of HbA1c versus the mean blood glucose (MBG) is an important guide for diabetes management but may differ between ethnic groups. In Africa, the patient's glucose information is limited or unavailable and the management is largely guided by HbA1c. We sought to determine if the reference data derived from the non-African populations led to an appropriate estimation of MBG from HbA1c for the East African patients.
Methods:
We examined the relationship of HbA1c versus MBG obtained by the continuous glucose monitoring in a group of East African youth having type 1 diabetes in Kenya and Uganda (n = 54) compared with the data obtained from A1c-derived average glucose (ADAG) and glucose management indicator (GMI) studies. A self-identified White (European heritage) population of youth (n = 89) with type 1 diabetes, 3-18 years old, living in New Orleans, LA, USA metropolitan area (NOLA), was studied using CGM as an additional reference.
Results:
The regression equation for the African cohort was MBG (mg/dL) = 32.0 + 16.73 × HbA1c (%), r = 0.55, p < 0.0001. In general, the use of the non-African references considerably overestimated MBG from HbA1c for the East African population. For example, an HbA1c = 9% (74.9 mmol/mol) corresponded to an MBG = 183 mg/dL (10.1 mmol/L) in the East African group, but 212 mg/dL (11.7 mmol/L) using ADAG, 237 mg/dL (13.1 mmol/L) using GMI and 249 mg/dL (13.8 mmol/L) using NOLA reference. The reported occurrence of serious hypoglycemia among the African patients in the year prior to the study was 21%. A reference table of HbA1c versus MBG from the East African patients was generated.
Conclusions:
The use of non-African-derived reference data to estimate MBG from HbA1c generally led to the overestimation of MBG in the East African patients. This may put the East African and other African patients at higher risk for hypoglycemia when the management is primarily based on achieving target HbA1c in the absence of the corresponding glucose data.
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