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The deficiency of minerals and lowered activity of total alkaline phosphatase is observed in women with threatened preterm delivery. Laboratory tests of calcium-phosphorus-magnesium homeostatsis have limited predictive value in regard to the term of delivery in women with threatened preterm delivery.

Premature uterine contractility in women in the second trimester is accompanied by lowered serum concentrations of total calcium, inorganic phosphorus, magnesium, total protein and albumin. There is also decreased activity of total alkaline phosphatase, its heat-stable fraction and placental lactogen which may have diagnostic value. Premature uterine contractility in women in the second trimester may be related to the disturbances of calcium-phosphorus-magnesium homeostasis and calcium supplementation should be considered.

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