A Calcium Measurement System Potentially Suitable for At-Home Monitoring

Calcium is a critical element in the human body, and variations from the optimal calcium level can be caused by many different mechanisms. In these conditions of calcium dysregulation, it would be highly beneficial to monitor calcium levels on an ongoing basis, to appropriately adjust treatment. In this letter, we present a system and assay potentially suitable for at-home calcium monitoring based on absorption measurements of calcium made in an Arsenazo III indicator solution. The results show a good correlation with laboratory values of calcium measured in serum and plasma. This system is also potentially suitable for the measurement of calcium concentration in other contexts, including monitoring of water hardness and aquarium calcium levels.