[Alakaline phosphatase levels in down's syndrome (author's transl)].

Levels of serum alkaline phosphatase activity were determined in a sample of 110 individuals affected by Down's syndrome, and in a sample of 299 healthy persons, males and females. The age of both populations was from 6 to 28. They were located in Madrid, but hailing from several Spanish provinces. Levels are higher for all age groups than those in the control population. Differences between both populations are statistically significant in the following age groups: from 6 to 8, 11 to 13 and 14 to 16. Other studies on alkaline phosphatase in various tissues were examined and the possible significance of this finding is discussed.