Table 2.

Calculation of Na delivery and reabsorption along the tubule, using typical human values for GFR, plasma Na concentration, and Na intake rate of 100 ml/min, 140 mEq/l, and 0.07 mEq/min (or 100 mEq/day), respectively

Tubular Segment	Fractional Reabsorption Rate, η	Na Delivery, mEq/min	Na Reabsorption, mEq/min	Reabsorption as %Filtered Load
PT	0.7	14.000	9.800	70%
LoH	0.88	4.2	3.7	26.4%
DCT	0.5	0.50	0.25	1.8%
CNT/CD	0.724*	0.25	0.18	1.3%
Urine excretion rate		0.07*

^*Significant difference.