An example medical device includes a physiological measurement device, a device management engine, a user caching engine, and a login engine. The device management engine is configured to receive data captured by the physiological measurement device. The user caching engine is configured to store cache records associated with users in a user cache. The login engine is configured to receive a user identifier associated with a user and determine whether the user identifier is associated with a cache record stored in the user cache. When determined that the user identifier is associated with a cache record stored in the user cache, the login engine is configured to log the user in. When not determined that the user identifier is associated with an unexpired cache record stored in the user cache, the login engine is configured to prompt the user for a credential.
