Get one of our gestational calculator wheels to help guide your patients through important pregnancy dates with this pocket reminder. Ideal for any nurse, midwife, student, resident, or OBGYN to help predict the next nine months of pregnancy, including the approximate date of delivery, prenatal genetic risk assessment screening, Crown Rump Length (CRL), and Biparietal Diameter (BPD). Each wheel is covered in heavy lamination to protect from daily use.