In a pregnant patient presenting with abdominal pain and suspected appendicitis, an initial ultrasound should be performed to exclude obstetric causes for abdominal pain. MRI may be a reasonable next study if it is immediately accessible and radiologists with expertise in MRI interpretation are available. Otherwise, CT should be utilized.
There is a normal drop in platelet count during pregnancy. In the first trimester, the normal count is around 250,000 and decreases to about 225,000 at delivery. Platelet counts <100,000 were rarely encountered in normal, uncomplicated pregnancies and should not generally be considered a physiologic change.