<unk>  can be used as an indicator of how the body is regulating<unk> . A<unk>  of zero means the kidney is producing urine isosmotic with respect to the plasma. Values greater than zero imply that the kidney is producing dilute urine through the excretion of solute-free<unk> . Values less than zero imply that the kidney is conserving<unk>  (likely under the influence of antidiuretic hormone, ADH), resulting in the production of concentrated urine.
Free water clearance
Net acid excretion
PAH clearance
Renal clearance ratio
Diffusing capacity
Glomerular filtration rate
Arterial input function
Renal blood flow