The failure of the body to function normally is known as a state of disease. Anytime the body is not at ease, it is in the disease state.
Kidney failure is the medical term meaning loss of renal function. It may also be called end stage renal disease late in the process.
End stage renal disease is the loss of renal function. Kidney failure is a term more common in lay language.
Organ failure
Hypothyroidism is a medical term meaning abnormally low thyroid function.
End-stage renal disease
Cryptoorchidism
Renal function is the medical term meaning kidney function. Renal means pertaining to the kidney.
Renal failure
Azotemia
The medical term for any disorder of pituitary function is "pituitary dysfunction" or "pituitary disorder".
atresia
LFTs for Liver Function Tests.