Correlation Between Capillary and Venous Blood Glucose in the Lactose Tolerance Test
The lactose tolerance test is a classic method for the study of lactose malabsorption. However, the methodology used has not been standardized, and this leads to differences in results.
The aim of this report was to analyze whether capillary blood glucose measurement is in agreement with venous blood glucose when performing lactose tolerance test.
This is a prospective study of consecutive patients with suspected lactose malabsorption who had lactose tolerance test performed in venous and capillary blood simultaneously, using a load of 50 g lactose. Agreement was measured using the concordance correlation coefficient of Lin (95 % CI) and Bland–Altman plots. The degree of agreement was measured using the Kappa index. A value of p < 0.05 was considered statistically significant.
Eighty-four patients (68 % women) were included. The concordance correlation coefficient showed very poor agreement between the two techniques: 0.68 (0.58–0.77), 0.72 (0.62–0.8), and 0.77 (0.69–0.83) for baseline, 30, and 60 min, respectively. The Bland–Altman plots showed that capillary blood glucose measurements result in higher levels than venous blood glucose measurements, with mean differences of 0.39, 0.77, and 1.1 mmol/L at baseline, 30, and 60 min, respectively. The degree of agreement was low, with a Kappa index of 0.59 (p < 0.001).
The test measured in venous blood is not in agreement with the measurement obtained from capillary blood. It is likely that the diagnostic accuracy attributed without distinction to lactose tolerance test in different studies for lactose malabsorption is incorrect, making it necessary to specify the analysis method.
KeywordsLactose tolerance test Lactose intolerance diagnosis Lactose malabsorption Glycemic variability
Lactose hydrogen breath test
Lactose tolerance test
Concordance correlation coefficient of Lin
We appreciate the tireless work of the nursing and medical consultation supporting staff, without which it would have been impossible to conduct this study.
Compliance with ethical standards
Conflict of interest
The protocol was approved by the institutional ethics committee, and informed consent was obtained from all patients.
- 21.Izquierdo F, Fatela D, Chueca MP. Detección de interferencias y otros errores en la medición de la glucemia en glucómetros portátiles. Recomendaciones 2012. Documentos de la SEQC. Comisión de Interferencias y Efectos de los Medicamentos. http://www.seqc.es. Accessed December 2012.