1. What is Perinatology Week Calculation?

Perinatology week calculation estimates the gestational age of pregnancy based on the last menstrual period (LMP). This method is widely used in obstetrics to track fetal development and schedule prenatal care.

2. How Does the Calculator Work?

The calculator uses the perinatology week formula:

Where:

• \( \text{LMP} \) — Last menstrual period date
• \( \text{Current Date} \) — Today's date or any specified date
• \( \left\lfloor \right\rfloor \) — Floor function (rounds down to nearest integer)

Explanation: The calculation determines how many complete weeks have passed since the first day of the last menstrual period.

3. Importance of Pregnancy Week Calculation

Details: Accurate pregnancy dating is essential for monitoring fetal growth, scheduling prenatal tests, determining due date, and identifying potential complications during pregnancy.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and the current date (or any date you want to check). The calculator will display the completed weeks of pregnancy.

5. Frequently Asked Questions (FAQ)

Q1: Why use LMP instead of conception date?
A: LMP is more reliably known than conception date and provides a standardized method for calculating gestational age across medical practices.

Q2: How accurate is this calculation?
A: This method provides a good estimate, but ultrasound dating in early pregnancy (first trimester) is more accurate for establishing gestational age.

Q3: What if I have irregular periods?
A: For women with irregular cycles, LMP-based dating may be less accurate. Early ultrasound is recommended for precise dating.

Q4: Does this account for leap years?
A: Yes, the calculation automatically accounts for leap years and varying month lengths when using proper date functions.

Q5: When should I see a doctor for confirmation?
A: Always consult with a healthcare provider for official pregnancy dating and prenatal care guidance.