A system comprising: a prediction criteria module, adapted to store one or more thoracic fluid accumulation prediction criteria; a parameter collection device, adapted to sense or receive at least one thoracic fluid accumulation parameter that is statistically associated with impending thoracic fluid accumulation; and a thoracic fluid accumulation prediction module, coupled to the prediction criteria module to receive the one or more thoracic fluid accumulation prediction criteria, and coupled to the parameter collection device to receive the at least one thoracic fluid accumulation parameter, characterised in that the thoracic fluid accumulation prediction module includes a probability processing module and a prediction processing module, the probability processing module configured to compare the one or more thoracic fluid accumulation prediction criteria and the at least one thoracic fluid accumulation parameter and configured to output to the prediction processing module a probability indication of the occurrence of impending thoracic fluid accumulation for each thoracic fluid accumulation parameter exceeding or substantially similar to a corresponding prediction criteria; and wherein the prediction processing module generates, using the probability indication output from the probability processing module, a probability assertion that an occurrence of impending thoracic fluid accumulation will occur during a specified time after the prediction, wherein the probability assertion includes both a magnitude of the probability and a defined time period during which the prediction is applicable, and wherein the probability assertion identifies which of the at least one thoracic fluid accumulation parameters contributed to the magnitude of the probability. a prediction criteria module, adapted to store one or more thoracic fluid accumulation prediction criteria; a parameter collection device, adapted to sense or receive at least one thoracic fluid accumulation parameter that is statistically associated with impending thoracic fluid accumulation; and a thoracic fluid accumulation prediction module, coupled to the prediction criteria module to receive the one or more thoracic fluid accumulation prediction criteria, and coupled to the parameter collection device to receive the at least one thoracic fluid accumulation parameter, characterised in that the thoracic fluid accumulation prediction module includes a probability processing module and a prediction processing module, the probability processing module configured to compare the one or more thoracic fluid accumulation prediction criteria and the at least one thoracic fluid accumulation parameter and configured to output to the prediction processing module a probability indication of the occurrence of impending thoracic fluid accumulation for each thoracic fluid accumulation parameter exceeding or substantially similar to a corresponding prediction criteria; and wherein the prediction processing module generates, using the probability indication output from the probability processing module, a probability assertion that an occurrence of impending thoracic fluid accumulation will occur during a specified time after the prediction, wherein the probability assertion includes both a magnitude of the probability and a defined time period during which the prediction is applicable, and wherein the probability assertion identifies which of the at least one thoracic fluid accumulation parameters contributed to the magnitude of the probability.