Some embodiments described herein generally relate to apparatus and methods for detecting gases in a body of a human or other animal. For example, such gases may be those normally contained within an organ of the body. The detected gases may, thus, indicate leakage of the contents of the organ into a body cavity. The apparatus may include one or more gas sensing probes at least partially positioned within a semipermeable material and configured to detect an intestinal gas and an electronic circuit coupled to the gas sensing probes. The electronic circuit may include a transmitter configured to transmit information from the gas sensing probes to an external device.
