A subcutaneously implantable device comprising: a housing; a clip attached to a top side of the housing that is configured to anchor the device to a muscle, a bone, and/or a first tissue; a first prong (106, 606A) with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a first lung; a first electrode (172, 672A) that is configured to contact the first lung; a second electrode (173, 672B) that is configured to contact the first lung or a second lung; and sensing circuitry in the housing in electrical communication with the first electrode and the second electrode that is configured to measure an impedance in the first lung and/or the second lung, and/or a transthoracic impedance across the first lung and the second lung. wherein either: the first electrode (172, 672A) and the second electrode (173, 672B) are on the first prong and the second electrode is configured to contact the first lung; or the first electrode is on the first prong and the device further comprises a a second prong with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a second lung, and the second electrode is on the second prong and configured to contact the second lung. a housing; a clip attached to a top side of the housing that is configured to anchor the device to a muscle, a bone, and/or a first tissue; a first prong (106, 606A) with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a first lung; a first electrode (172, 672A) that is configured to contact the first lung; a second electrode (173, 672B) that is configured to contact the first lung or a second lung; and a first prong (106, 606A) with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a first lung; a first electrode (172, 672A) that is configured to contact the first lung; a second electrode (173, 672B) that is configured to contact the first lung or a second lung; and sensing circuitry in the housing in electrical communication with the first electrode and the second electrode that is configured to measure an impedance in the first lung and/or the second lung, and/or a transthoracic impedance across the first lung and the second lung. electrode and the second electrode that is configured to measure an impedance in the first lung and/or the second lung, and/or a transthoracic impedance across the first lung and the second lung. wherein either: the first electrode (172, 672A) and the second electrode (173, 672B) are on the first prong and the second electrode is configured to contact the first lung; or the first electrode is on the first prong and the device further comprises a a second prong with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a second lung, and the second electrode is on the second prong and configured to contact the second lung. the first electrode (172, 672A) and the second electrode (173, 672B) are on the first prong and the second electrode is configured to contact the first lung; or the first electrode is on the first prong and the device further comprises a a second prong with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a second lung, and the second electrode is on the second prong and configured to contact the second lung.