Diabetes care: reasons for missing HbA1c measurements in general practice
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Updated: May 31, 2026

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Published on: June 11, 2012
Debby G Keuken1, Henk J Brouwer, Parad S Keijser
1Department of General Practice, Division of Clinical Methods & Public Health, Academic Medical Center-University of Amsterdam, Amsterdam, Netherlands. d.g.keuken@amc.uva.nl.
Insights
Many patients with type 2 diabetes miss glycated haemoglobin (HbA1c) tests, primarily because they are under specialized care. This highlights challenges in diabetes care quality monitoring within primary health centers.
Area of Science:
- Diabetes Mellitus Research
- Primary Care Quality Improvement
- Clinical Audit
Background:
- Glycated haemoglobin (HbA1c) is a key indicator for assessing diabetes care quality.
- Complete patient data registration, including HbA1c, is often challenging to achieve.
- Understanding reasons for missing data is crucial for improving diabetes management.
Purpose of the Study:
- To investigate the reasons behind missing glycated haemoglobin (HbA1c) measurements in type 2 diabetes patients.
- To identify factors contributing to incomplete data in electronic medical records within primary care settings.
Main Methods:
- Retrospective analysis of HbA1c measurements for 1485 type 2 diabetes patients.
- Data collected from 19 general practitioners across 4 primary care health centers in Amsterdam.
- Examination of documented reasons for absent HbA1c test results.
Main Results:
- A significant proportion of patients (23.9%, n=356) had missing HbA1c measurements.
- The primary reason cited for missing tests was the patient receiving specialized care (50% of cases).
- General practitioners reported various other reasons for the lack of HbA1c data.
Conclusions:
- Specialized care status is a major factor contributing to missing HbA1c measurements in primary care.
- Insights gained can inform strategies to improve data completeness and diabetes care monitoring.
- Addressing data gaps is essential for accurate quality assessment in diabetes management.
Background:
Glycated haemoglobin (HbA1c) is often used as one of the indicators to measure the quality of diabetes care. Complete registration is difficult to obtain. This study investigated the reasons for missing HbA1c measurements.
Findings:
HbA1c measurements for 1485 patients with diabetes mellitus type 2 who were attended by 19 general practitioners at 4 primary care health centres in south-east Amsterdam were studied. HbA1c measurements were missing for 356 (23.9%) of the patients. The main reason stated in 50% of the cases was that the patient was under specialized care.
Conclusions:
The general practitioners provided multiple reasons for the missing HbA1c measurements. This study provides insight into why HbA1c measurements were not present in the patients' electronic medical record.
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