transport maximum

maximum /max·i·mum/ (mak´sĭ-mum) pl. max´ima   [L.]

1. the greatest possible, or actual, effect or quantity.

2. largest; utmost.max´imal

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transport maximum , tubular maximum (Tm) the highest rate (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.

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transport maximum

n. Abbr. Tm

The maximal rate of secretion or reabsorption of a substance by the renal tubules. Also called tubular maximum.

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transport maximum, tubular maximum (T_m),

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 T_m with inferior letters representing the substance used in the test, such as T_mPAH (transport maximum for p-aminohippuric acid). Also called tubular maximum.