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HCG Levels by Pregnancy Week:
| Weeks Since LMP | HCG Range (mIU/mL) |
|---|---|
| 3 weeks | 5 - 50 |
| 4 weeks | 5 - 426 |
| 5 weeks | 18 - 7,340 |
| 6 weeks | 1,080 - 56,500 |
| 7-8 weeks | 7,650 - 229,000 |
| 9-12 weeks | 25,700 - 288,000 |
| 13-16 weeks | 13,300 - 254,000 |
| 17-24 weeks | 4,060 - 165,400 |
| 25-40 weeks | 3,640 - 117,000 |
| From: | To: |
Human chorionic gonadotropin (HCG) is a hormone produced by the placenta after implantation. It's the hormone detected by pregnancy tests. HCG levels rise rapidly in early pregnancy, doubling approximately every 48-72 hours in the first 4 weeks.
HCG levels follow a predictable pattern in normal pregnancies:
While HCG levels can provide a rough estimate of pregnancy duration, there is wide variation between individuals. This calculator provides typical ranges:
| Weeks Since LMP | HCG Range (mIU/mL) |
|---|---|
| 3 weeks | 5 - 50 |
| 4 weeks | 5 - 426 |
| 5 weeks | 18 - 7,340 |
| 6 weeks | 1,080 - 56,500 |
| 7-8 weeks | 7,650 - 229,000 |
Important: HCG levels alone cannot precisely determine gestational age. Ultrasound is more accurate for dating a pregnancy, especially when performed in the first trimester.
Q1: How accurate is HCG for dating pregnancy?
A: Only moderately accurate due to wide normal ranges. Ultrasound is preferred for precise dating.
Q2: What if my HCG is higher than expected?
A: Could indicate multiple pregnancy, molar pregnancy, or incorrect dates. Consult your doctor.
Q3: What if my HCG is lower than expected?
A: Could indicate ectopic pregnancy, miscarriage, or incorrect dates. Consult your doctor.
Q4: When should HCG levels be checked?
A: Typically only when there are concerns about pregnancy viability or location (e.g., suspected ectopic).
Q5: Can HCG predict pregnancy outcomes?
A: Serial measurements showing appropriate rise are reassuring, but single values have limited predictive value.