![]() Factors that cause stress lead to alteration or loss of homeostasis in animals, affecting their fitness and reproductive capacity (e.g. crabs, Lu et al., 2015 Rajendiran et al., 2016 mussels, Hannan et al., 2016). fishes, Jentoft et al., 2005 birds, Remage-Healey and Romero, 2000 reptiles, Valverde et al., 1999) and invertebrates (e.g. Glucose is a valuable blood parameter in physiology studies, being widely used to evaluate response to stressors in both vertebrates (e.g. We conclude that POC glucose meters are unsuitable for assessing glucose in mussels and should not be used in crabs as results are inaccurate. When simulating experimental conditions, POC results differed from those found using the standard method. thayeri haemolymph, Bland–Altman plots showed a strong bias and wide limits of agreement, and Lin's concordance correlation coefficient showed a weak concordance between methods. Additionally, despite the device being capable of measuring glucose in L. perna haemolymph due to equipment inaccuracy and low glucose concentration in this species (10.13 ± 6.25 mg/dL). The device was unable to measure glucose in P. We tested if a POC device can be used to measure haemolymph glucose in two widely used models, Leptuca thayeri and Perna perna, compared with a standard laboratory method. In invertebrates, the use of POC glucose meters is still scarce, and no study yet has evaluated their usability in crustaceans and molluscs. In this regard, POC glucose meters are becoming valuable tools for conservation physiologists, as glucose can be a useful indicator of stress response. Point-of-care (POC) devices, originally intended for human use, are increasingly being used for measuring blood parameters of animals in the field. However, its measurement in the field is often difficult due to the need for expensive and non-portable equipment. Blood glucose is widely used as a physiological parameter for vertebrates and invertebrates.
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