FIGURE 5-1. Relation of serum Pi to absorbed intake in adults with normal renal function.

FIGURE 5-1Relation of serum Pi to absorbed intake in adults with normal renal function

(See Nordin [1989] for further details.) The solid curve can be empirically approximated by the following equation: Pi = 0.00765 × AbsP + 0.8194 × (1 − e(−0.2635 × AbsP), in which Pi = serum Pi (in mmol/liter), and AbsP = absorbed phosphorus intake (also in mmol). Solving this equation for the lower and upper limits of the normal range for Pi, as well as for its midpoint, yields the values presented in Table 5-1. The dashed horizontal lines represent approximate upper and lower limits of the normal range, while the dashed curves reflect the relationship between serum Pi and ingested intake for absorption efficiencies about 15 percent higher and lower than average. (© Robert P. Heaney, 1996. Reproduced with permission.)

From: 5, Phosphorus

Cover of Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride
Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride.
Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes.
Washington (DC): National Academies Press (US); 1997.
Copyright © 1997, National Academy of Sciences.

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