Tubular maximum
Maximum amount of a substance reabsorbed by renal tubules per unit time.
Also: Tm, TmP
Transport-saturable ceiling for renal reabsorption of a substance (e.g., phosphate TmP, glucose Tm). Once exceeded, the substance appears in urine.
How one textbook covers it
Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Transport-saturable ceiling for renal reabsorption of a substance (e.g., phosphate TmP, glucose Tm). Once exceeded, the substance appears in urine.