1. What is Beta HCG?

Human chorionic gonadotropin (hCG) is a hormone produced during pregnancy. The beta subunit of hCG is measured in pregnancy tests and is used to monitor early pregnancy progression.

2. How Does the Calculator Work?

The calculator uses the HCG doubling equation:

Where:

• Initial HCG — First measured hCG level (mIU/mL)
• Days — Time elapsed since initial measurement (days)
• Doubling Time — Expected doubling time (typically ~2 days in early pregnancy)

Explanation: The equation models the exponential growth of hCG levels in early pregnancy, where levels typically double every 48 hours in viable pregnancies.

3. Importance of HCG Doubling

Details: Monitoring hCG doubling time helps assess early pregnancy viability. Slower doubling times may indicate ectopic pregnancy or potential miscarriage, while faster doubling times may suggest multiple gestation.

4. Using the Calculator

Tips: Enter initial hCG level in mIU/mL, days since initial test, and expected doubling time (default is 2 days). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal hCG doubling time?
A: In early pregnancy (first 4 weeks), hCG typically doubles every 48-72 hours. After 6-7 weeks, the doubling time slows.

Q2: When should I be concerned about hCG levels?
A: If levels don't double in 3 days or decrease, consult your healthcare provider. However, single measurements are less meaningful than trends.

Q3: What are normal hCG levels by week?
A: Levels vary widely, but generally: 3 weeks: 5-50 mIU/mL, 4 weeks: 5-426 mIU/mL, 5 weeks: 18-7,340 mIU/mL, 6 weeks: 1,080-56,500 mIU/mL.

Q4: Can this calculator predict pregnancy viability?
A: While helpful, hCG levels alone cannot confirm viability. Ultrasound is needed for definitive diagnosis.

Q5: What if my levels are higher than expected?
A: Higher levels could indicate multiple pregnancy, molar pregnancy, or incorrect dating. Consult your provider for evaluation.