1. What is Gestational Age?

Gestational age is the common term used during pregnancy to describe how far along the pregnancy is. It is measured in weeks from the first day of the woman's last menstrual period (LMP) to the current date.

2. How is Gestational Age Calculated?

The standard method for calculating gestational age uses this formula:

Where:

• \( \text{LMP} \) — First day of last menstrual period (date)
• \( \text{Current Date} \) — Today's date or assessment date (date)
• 7 — Days per week conversion factor

Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14. The actual conception date is typically about 2 weeks after the LMP.

3. Importance of Gestational Age

Details: Accurate gestational age determination is crucial for proper prenatal care, timing of tests, evaluating fetal growth, and determining the due date (estimated date of delivery).

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and the current date (or date of assessment). The calculator will determine how many weeks and days pregnant you are.

5. Frequently Asked Questions (FAQ)

Q1: What if I don't know my LMP?
A: If LMP is unknown, an ultrasound measurement in early pregnancy can estimate gestational age.

Q2: How accurate is this calculation?
A: It's accurate for women with regular 28-day cycles. Irregular cycles may require ultrasound confirmation.

Q3: What's the difference between gestational age and fetal age?
A: Gestational age is about 2 weeks more than fetal (conceptual) age, as it counts from LMP rather than conception.

Q4: When should I see a doctor for pregnancy confirmation?
A: Schedule your first prenatal visit when you have a positive pregnancy test, typically around 8 weeks gestational age.

Q5: How is this used to determine my due date?
A: The estimated due date (EDD) is calculated as LMP + 280 days (40 weeks).