1. A computer-implemented method for managing manual entries of blood glucose measures for a patient in relation to a structured collection procedure administered by a portable computing device, comprising: managing, by the portable computing device, a structured collection procedure for a user of the portable computing device, where the structured collection procedure specifies one or more collection events for obtaining blood glucose measures for a patient; retrieving a data entry from a logbook residing in a data store on the portable computing device, where the data entry includes a blood glucose measure and a time at which the blood glucose measure was taken, the data entry being in response to the specified one or more collection events; presenting the retrieved data entry to the user on a display of the portable computing device; receiving a modification to values of the data entry from the user; evaluating the modified data entry in relation to the structured collection procedure using a membership rule set, where the membership rule set defines rules for associating data entries with structured collection procedures including adherence of date and time and adherence to a previous data entry; and inputting the modified data entry into the logbook.