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Pre-HbA1c in children with insulin dependent diabetes mellitus
Insights
Short-term blood glucose fluctuations in children with diabetes are linked to preHbA1c levels. This intermediate glycosylated hemoglobin form, pre-glycated hemoglobin (preHbA1c), offers a rapid indicator of recent glycemic control.
Area of Science:
- Biochemistry
- Endocrinology
- Clinical Chemistry
Background:
- Glycosylated hemoglobin (HbA1c) reflects long-term glycemic control in diabetes.
- Day-to-day HbA1c variations are influenced by the intermediate aldimide form, preHbA1c.
- PreHbA1c represents a more immediate marker of glucose exposure.
Purpose of the Study:
- To investigate the role of preHbA1c in short-term glycemic fluctuations.
- To correlate preHbA1c levels with recent urinary glucose concentrations in diabetic children.
- To differentiate preHbA1c from stable HbA1c and glycosylated albumin.
Main Methods:
- Electrofocusing was used to study the preHbA1c component.
- Erythrocytes were incubated with glucose to assess preHbA1c formation and reversibility.
- PreHbA1c levels were measured in children with insulin-dependent diabetes mellitus.
Main Results:
- PreHbA1c fraction increased upon glucose incubation and was reversible.
- In diabetic children, preHbA1c levels ranged from 0.2% to 3.7% (median 1.3%).
- A strong correlation was observed between preHbA1c and recent urinary glucose levels (r=0.75, p<0.001).
Conclusions:
- PreHbA1c is a sensitive indicator of short-term glycemic variability.
- PreHbA1c levels correlate with recent glucose exposure, unlike HbA1c or glycosylated albumin.
- PreHbA1c may serve as a valuable marker for monitoring acute glycemic changes in diabetes management.
Abstract:
Day-to-day fluctuations in blood concentration of the glycosylated hemoglobin, HbA1c or HbA1, are mainly due to variations in content of the intermediate aldimide form, preHbA1c. Using electrofocusing we have studied this component adjacent to the HbA1c band, which represents the stable ketoamine form. The fraction of preHbA1c present rapidly increases upon incubation of erythrocytes in 20 mM glucose at +37 degrees C, and the reaction is fully reversible if glucose is removed. In children with insulin-dependent diabetes mellitus with different degrees of metabolic control, levels of preHbA1c varied between 0.2 and 3.7% of total hemoglobin (median value 1.3%, N = 25). A clear correlation was found between preHbA1c and urinary glucose concentrations during the 12 hours preceding blood sampling (r = 0.75, p less than 0.001, df = 18). As expected, pre-HbA1c did not correlate to HbA1c or glycosylated albumin, which reflect long- and medium-term diabetic control.