Comparison of Glycated Hemoglobin Results Based on At-Home and In-Lab Dried Blood Spot Sampling to Routine Venous Blood Sampling In-Lab in Adult Patients With Type 1 or Type 2 Diabetes

Published:December 25, 2017DOI:



      Regular measurement of glycated hemoglobin (A1C) is logistically demanding. Home blotter-paper collection offers an alternative. This study tested the viability of at-home blotter-paper A1C measurement.


      Objective: compare accuracy of A1C levels collected on blotter paper at home (home-blotter) and blotter-paper collection in laboratory (lab-blotter) with venous A1C (routine measurement). Agreement was assessed by Pearson correlation, Lin concordance correlation coefficient (CCC), positive and negative predictive values (PPVs, NPVs) and Bland-Altman plots and associated statistics.


      Home-blotter, lab-blotter and venous A1C correlated strongly (0.93, 0.93). Home- and lab-blotter results were upwardly biased (0.387%, 0.1%). Bias increased with time. Bias correction provided agreement for both blotters (CCC >0.9); blotters correctly identifying levels above 7% (53 mmol/mol) were 100% for corrected home-blotters and 87% (95% confidence interval) for corrected lab-blotters. NPVs (% blotters correctly identifying levels of 7% or lower [53 mmol/mol]) were 100% for corrected home-blotters and 83% for corrected lab-blotters. After correction, >92% of corrected blotters had errors of 8% or less. Of our subjects, 88.5% found home sampling preferable to routine laboratory sampling.


      Home-blotter collection is an alternative to routine collection.



      La mesure régulière de l’hémoglobine glyquée (A1c) est astreignante sur le plan logistique. Le prélèvement sur papier buvard à domicile s’avère une solution de rechange. La présente étude permet de tester la viabilité des mesures de l’A1c sur papier buvard à domicile.


      L’objectif était de comparer l’exactitude des prélèvements de l’A1c sur papier buvard à domicile (buvard-domicile) et du prélèvement sur papier buvard en laboratoire (buvard-laboratoire) au prélèvement veineux de l’A1c (mesures systématiques). Le coefficient de corrélation de Pearson, le coefficient de concordance (CC) de Lin, les valeurs prédictives positives et négatives (VPP et VPN), le graphique de Bland-Atman et les statistiques associées ont permis d’évaluer la concordance.


      Il existe une forte corrélation entre le buvard-domicile, le buvard-laboratoire et le prélèvement veineux de l’A1c (0,93; 0,93). Les résultats des buvards-domicile et des buvards-laboratoire étaient légèrement biaisés à la hausse (0,387 %, 0,1 %). Les biais augmentaient au fil du temps. La correction des biais offrait une concordance pour les deux types de prélèvements sur buvard (CC > 0,9) : les buvards permettant de bien détecter les concentrations supérieures à 7 % (53 mmol/mol) étaient de 100 % pour les buvards-domicile corrigés et de 87 % (IC à 95 %) pour les buvards-laboratoire corrigés. Les VPN (% des buvards permettant de bien détecter les concentrations de 7 % ou moins [53 mmol/mol]) étaient de 100 % pour les buvards-domicile corrigés et de 83 % pour les buvards-laboratoire corrigés. Après la correction, > 92 % des buvards corrigés montraient des erreurs de 8 % ou moins. Parmi les sujets, 88,5 % trouvaient préférables les prélèvements d’échantillons à domicile aux prélèvements d’échantillons systématiques en laboratoire.


      Le prélèvement buvard-domicile s’avère une solution de rechange au prélèvement systématique.


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