Abstract
The total amount of extracellular calcium in the body is less than 1% of the total body calcium and equals the sum of the calcium in the plasma and in the interstitial fluid (Table 10.1). The normal mean plasma calcium concentration is 10 mg/100 ml and as the plasma accounts for approximately 5% of body weight, the total amount of calcium in the plasma of a 70-kg man is about 350 mg. The normal mean concentration of (ultrafiltrable) calcium in the interstitial fluid is about 5.6 mg/100 ml. Interstitial fluid accounts for approximately 18% of body weight. The total amount of calcium in the interstitial fluid of a 70-kg man is therefore about 700 mg.
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