Kidney
The kidney was an excretory organ incorporated as part of the renal system. It functioned to maintain the water, the acid-base concentration, and filter the blood; the waste products were excreted as urine. The organ was described by the Malcorians and Gosis' species as the renal organ.

Denobulan lemur kidneys were a delicacy. ()

In 1986, Dr. Leonard McCoy gave a kidney pill to an elderly woman in San Francisco who was suffering from "kidney dialysis."  The pill apparently caused the spontaneous growth of a new kidney. ()

In 2153, Major Hayes was left with a bruised kidney following a fight with Malcolm Reed. ()

In 2268, McCoy suffered 70% kidney failure after being tortured by the Vians. ()

In 2269, McCoy told Janice Lester, who had taken over James T. Kirk's body, that his kidneys were "functioning at their usual, normal peak of efficiency." ()

After living with Spock's katra in his head, McCoy stated that he would have "felt safer giving him one of his kidneys than having what was scrambled in his brain." ()

The drug Vasokin had severely damaged patients' kidneys, lungs and hearts in twenty-two percent of cases according to Dr. Bashir in 2371, when he administered it to Bareil Antos. ()

In 2372, a duplicate of Tuvok created by a subspace divergence field was attacked and killed by the Vidiians. Tuvok's right kidney was damaged when he was fired upon. ()

In 2373, a patient of Dr. Bashir on Ajilon Prime suffered from kidney failure and went into renal shock. ()

In 2375, Samantha Wildman suffered a punctured kidney following the crash of the . ()

Soon after, B'Elanna Torres' kidneys began to fail when she was attacked by a cytoplasmic lifeform. ()

There was a widely circulated tale among Starfleet cadets about a man who got invited to an evening of passion with a woman on Risa, only to wake up with a missing kidney. ()

In 2377, Chakotay was knocked unconscious by a chronokinetic surge and taken to sickbay. Upon examination, The Doctor found his body was in a state of temporal flux, as he had the liver of an eighty-year old and the kidneys of a twelve-year old boy. Fortunately, The Doctor injected Chakotay with a chroniton-infused serum which brought his body back into temporal alignment. ()

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