Systems and methods for sensing lung fluid and functionality

A method of differentiating between medical states of a subject, the apparatus comprising:

• iterating for a plurality of combinations each including a selected frequency spectrum of an alternating current and a selected electrode pair including at least one first electrode disposed on a distal end of a feeding tube for feeding a subject and at least one second electrode sized and shaped for contacting a surface of a skin of the subject:
• computing an impedance value according to voltage over the selected electrode pair and according to the alternating current applied at the selected frequency spectrum,
• computing a sub-impedance score according to the computed impedance value;
• and
• differentiating between at least two medical states of the subject according to a plurality of the computed sub-impedance scores.

A computer program product for differentiating between medical states of a subject, the apparatus comprising:

• a non-transitory memory having stored thereon a code which, when executed by at least one hardware processor of a computing device, while a feeding tube is in use, cause the at least one hardware processor to:
• (1) select a combination including a selected frequency spectrum of an alternating current and a selected electrode pair including at least one first electrode disposed on a distal end of a feeding tube for feeding a subject and at least one second electrode sized and shaped for contacting a surface of a skin of the subject;
• (2) compute an impedance value according to voltage over the selected electrode pair and according to the alternating current applied at the selected frequency spectrum, and
• (3) compute a sub-impedance score according to the computed impedance value;
• (4) iterate (1), (2), and (3) for another combination;
• (5) differentiate between at least two medical states of the subject according to a plurality of the computed sub-impedance scores.