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Reference Values During Pregnancy


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Calcium, ionized (serum)

   Units Nonpregnant Adult First Trimester Second Trimester Third Trimester
mg/dL 4.5 - 5.3 4.5 - 5.1 4.4 - 5 4.4 - 5.3
mmol/L 1.13 - 1.33 1.13 - 1.28 1.1 - 1.25 1.1 - 1.33

Some causes of elevated calcium levels include malignancy , hyperparathyroidism, sarcoidosis, vitamin D intoxication, and hyperthyroidism


References:

Abbassi-Ghanavati M, Greer LG, Cunningham FG. Pregnancy and laboratory studies: a reference table for clinicians. Obstet Gynecol. 2009 Dec;114(6):1326-31. PMID:19935037
Wallach, J. Interpretation of Diagnostic Tests, Eighth ed. Lippincott Williams & Wilkins, 2007 Fischbach FT, Dunning MB III, eds. A Manual of Laboratory and Diagnostic Tests, 7th ed. Philadelphia, Lippincott Williams and Wilkins,2004

 

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