Nplate® Pregnancy Exposure RegistryNPER

-Eligible subjects will be currently pregnant women residing in the US who: Have had any exposure to Nplate® at any time during the pregnancy, which is defined as the period between first day of the last menstrual period (LMP) (ie, within two weeks of conception) up to any date before the date of delivery or end of the pregnancy. The date of conception will be defined as fourteen days prior to the next expected menstrual period for women who report a regular menstrual cycle. If the date of the first day of the LMP is unclear, or if the estimated date of conception as determined by a first-trimester ultrasound differs by more than one week from the date as determined by the first day of LMP, the first-trimester ultrasound-derived date will be used to estimate the timing of exposure to Nplate®, as well as timing of enrollment. If neither a clear date of the first day of the LMP nor a first-trimester ultrasound is available, the estimated date of conception for purposes of enrollment will be determined by best estimate of the woman’s prenatal care provider. -Agree to enroll at any time from the estimated date of conception up to any date before the date of delivery or end of the pregnancy and who have not already had prenatal diagnosis of any major structural birth defect in the current pregnancy prior to enrollment. -Agree to provide consent for participation in the registry including follow-up interviews.

-Subjects will be ineligible for study participation if any of the following apply: -Exposure to Nplate® did not occur during pregnancy. -Prior knowledge of prenatal diagnosis of a birth defect. Patients who fall under this category will be encouraged to call the Amgen PSP toll free number for enrollment and follow-up. -Cases reported to the NPER after completion of the exposed pregnancy. Patients who fall under this category will be encouraged to call the Amgen PSP toll free number for enrollment and follow-up.