tubular maximum


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maximum

 [mak´sĭ-mum]
the greatest quantity, effect, or value possible or achieved under given circumstances. adj., adj max´imal.
transport maximum (tubular maximum) Tm , the highest rate in milligrams per minute at which the renal tubules can transfer a substance either from the tubular luminal fluid to the interstitial fluid or from the interstitial fluid to the tubular luminal fluid, beyond which it may be excreted in the urine. In kidney function tests, it is expressed as Tm with inferior letters representing the substance used in the test, such as TmPAH (transport maximum for p-aminohippuric acid).

trans·port max·i·mum (Tm),

the maximal rate of secretion or reabsorption of a substance by the renal tubules.
Synonym(s): tubular maximum

tubular maximum

maximum

the greatest quantity, effect or value possible or achieved under given circumstances.

maximum permissible dose
see dose equivalent limits.
tubular maximum
the highest rate in milligrams per minute at which the renal tubules can transfer artificially administered test substances; the maximal tubular excretory capacity. Abbreviated Tm.