The validity of monitoring the control of diabetes with random blood glucose testing

Oyekemi Funke Daramola; Bob Mash

The validity of monitoring the control of diabetes with random blood glucose testing

Oyekemi Funke Daramola University of Stellenbosch
Bob Mash University of Stellenbosch

Keywords: Diabetes, glycaemic control, random blood glucose, glycated haemoglobin, clinical decision making

Abstract

It is important to decide if a patient with diabetes has good glycaemic control in order to guide treatment and to offer behaviour change counselling. Currently, determining random blood glucose (RBG) is usually carried out in primary care in the public sector to make this decision. This study investigates the validity of these decisions. Retrospective data from a district hospital setting were used to analyse the correlation between glycated haemoglobin (HbA1c) and RBG, the best predictive value of RBG, and its predictive properties. The best value of RBG to predict control (HbA1c ≤ 7%) was 9.8 mmol/l. However, this threshold only gave a sensitivity of 77% and a specificity of 75%. Clinicians would be wrong 23% of the time when using RBG to determine glycaemic control. Attempts should be made to make HbA1c more available for clinical decision-making. Point-of-care testing for HbA1c should be considered.

Author Biographies

Oyekemi Funke Daramola, University of Stellenbosch

Family Physician Division of Family Medicine and Primary Care University of Stellenbosch

Bob Mash, University of Stellenbosch

MBChB, DRCOG, DCH, MRCGP, FCFP(SA), PhD Head Division of Family Medicine and Primary Care University of Stellenbosch

Published

2013-09-19

Issue

Vol 55 No 6: November/December 2013

Section

Scientific letters

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