Figure 1:

Relationship between plasma glucose concentration measured in the laboratory using the glucose oxidase method and (a) the glucometer venous blood glucose reading, (b) absolute discrepancy and (c) percentage discrepancy of the glucometer venous blood glucose reading. Plasma samples were obtained at the same time as venous glucometer readings from adult female grey seals (circles) during early (Day 5; n = 19; open symbol) and late lactation (Day 15; n = 17; closed symbol); their pups (squares) during early (n = 20; open symbol) and late suckling (n = 19; closed symbol); and the same pups (triangles) early (Day 5; n = 17; open symbol) and late (Day 15; n = 13; closed symbol) in the postweaning fast. Solid trendlines drawn for illustrative purposes. In (b) dashed lines represent 20% glucometer accuracy across the concentration range, which is deemed acceptable for clinical purposes in humans.