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 Reference Values During Pregnancy

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Prothrombin time (plasma)

   Units Nonpregnant Adult First Trimester Second Trimester Third Trimester

seconds

 12.7 - 15.4 9.7 - 13.5 9.5 -13.4 9.6 - 12.9
         

 

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
 

 

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