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 Reference Values During Pregnancy

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Urea nitrogen , BUN (serum)

   Units Nonpregnant Adult First Trimester Second Trimester Third Trimester
mg/dL 7 -20 7 -12 3 - 13 3 -11
mmol/L 2.5 - 7.1 2.5 - 4.3 1.1 - 4.6 1.1 - 3.9

 

References:
1. 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

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