The Due Date Calculator for Pregnant Patients, often referred to as the Last Menstrual Period (LMP) Calculator, is specifically designed to estimate the expected date of delivery (EDD) or "due date" based on the first day of a woman's last menstrual period. This is a critical aspect of prenatal care, as it helps clinicians to monitor fetal development, schedule appropriate prenatal tests, and anticipate potential complications. 

The LMP calculator assumes a standard 28-day menstrual cycle and that ovulation occurs on day 14. Therefore, it may not be accurate for women with irregular cycles, those who cannot recall the first day of their last menstrual period, or those who conceived while using contraceptive methods that suppress menstruation. Additionally, it may not be applicable for pregnancies resulting from assisted reproductive technologies such as in-vitro fertilization, where the date of conception is known. In such cases, alternative methods of estimating the due date may be more appropriate.

Due Date Calculator for Pregnant Patients (last menstrual period)