1. What is hCG?

Human Chorionic Gonadotropin (hCG) is a hormone produced during pregnancy by the placenta. Its levels rise rapidly in early pregnancy and can be used to estimate gestational age.

2. How Does the Calculator Work?

The calculator uses the gestational weeks estimation formula:

Where:

• \( hCG \) — Human Chorionic Gonadotropin level (mIU/mL)
• \( \log_{10} \) — Base-10 logarithm

Explanation: The formula uses logarithmic approximation to estimate gestational weeks based on the exponential growth pattern of hCG levels in early pregnancy.

3. Importance of hCG Monitoring

Details: Monitoring hCG levels helps confirm pregnancy viability, estimate gestational age, and detect potential complications like ectopic pregnancy or miscarriage.

4. Using the Calculator

Tips: Enter hCG level in mIU/mL. The value must be positive. This calculator provides an estimate and should be used in conjunction with medical supervision.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this estimation?
A: This provides a rough estimate. Actual gestational age can vary based on individual factors and should be confirmed by ultrasound.

Q2: What are typical hCG ranges by week?
A: hCG doubles every 48-72 hours in early pregnancy, ranging from 5-50 mIU/mL at 3 weeks to over 100,000 mIU/mL by 8-10 weeks.

Q3: When should hCG levels be measured?
A: For dating purposes, measurements are most useful between 4-8 weeks gestation. Serial measurements provide more information than single values.

Q4: Are there limitations to this calculation?
A: Yes, hCG levels vary significantly between individuals. Multiple pregnancies, molar pregnancies, or abnormal developments can affect results.

Q5: Should this replace ultrasound dating?
A: No, ultrasound remains the gold standard for pregnancy dating. This calculator should be used as a supplementary tool only.