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4947545 
Journal Article 
Modulation of plasma 1,25-dihydroxyvitamin D in man by stimulation and suppression tests 
Eisman, JA; Wark, JD; Prince, RL; Moseley, JM 
1979 
1 
The Lancet
ISSN: 0140-6736
EISSN: 1474-547X 
2 
8149 
931-933 
English 
91025 
In normal volunteers infusion of parathyroid extract raised plasma 1,25-dihydroxyvitamin D (1,25-[OH]2D) levels by 80% (peak 8--40 h after infusion) without producing any significant change in plasma calcium, phosphate, or magnesium. An oral calcium load suppressed plasma 1,25-(OH)2D to 63% of control values within 48--72 h. These responses will be useful in the diagnosis and management of disturbances of calcium and mineral metabolism in which vitamin D metabolism is abnormal. 
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