Normal hCG (human chorionic gonadotropin) levels depend almost entirely on how far along a pregnancy is, and the range at any given week is remarkably wide. In non-pregnant individuals, a normal hCG level is less than 5 mIU/mL. During pregnancy, levels can climb from as low as 5 mIU/mL at 3 weeks to over 200,000 mIU/mL by weeks 9 through 12, then gradually decline for the rest of the pregnancy.
Normal hCG Levels by Week of Pregnancy
hCG is produced by the placenta shortly after a fertilized egg implants in the uterus. It’s the hormone detected by home pregnancy tests. Levels are measured in mIU/mL (milli-international units per milliliter) and are counted from the first day of your last menstrual period, not from conception. Here are the standard reference ranges:
- 3 weeks: 5 to 50 mIU/mL
- 4 weeks: 5 to 426 mIU/mL
- 5 weeks: 18 to 7,340 mIU/mL
- 6 weeks: 1,080 to 56,500 mIU/mL
- 7 to 8 weeks: 7,650 to 229,000 mIU/mL
- 9 to 12 weeks: 25,700 to 288,000 mIU/mL
- 13 to 16 weeks: 13,300 to 254,000 mIU/mL
- 17 to 24 weeks: 4,060 to 165,400 mIU/mL
- 25 to 40 weeks: 3,640 to 117,000 mIU/mL
The most important thing to notice is how enormous these ranges are. At 5 weeks, one healthy pregnancy might show an hCG of 18 while another shows 7,000. A single hCG number on its own rarely tells the full story. What matters more in early pregnancy is how your levels change over time.
How Fast hCG Should Rise in Early Pregnancy
In the first weeks, hCG levels typically double about every 72 hours. As levels climb higher, the doubling rate slows to roughly every 96 hours. This pattern of steady, predictable increases is often more meaningful than any single measurement.
The expected rate of increase depends on where your starting level falls. When hCG is below 1,500 mIU/mL, a healthy intrauterine pregnancy will show at least a 49% increase over 48 hours in 99% of cases. Between 1,500 and 3,000 mIU/mL, the expected minimum 48-hour increase drops to about 40%. Above 3,000 mIU/mL, a rise of at least 33% over 48 hours is considered normal.
This is why doctors often order two blood draws spaced 48 hours apart rather than relying on a single result. The trend line gives a much clearer picture of whether a pregnancy is progressing normally.
When hCG Peaks and Declines
hCG reaches its highest concentration toward the end of the first trimester, roughly between weeks 9 and 12, when levels can exceed 200,000 mIU/mL. This peak coincides with the period when many people experience the worst nausea and fatigue, since hCG is thought to contribute to morning sickness.
After that peak, levels gradually drop through the second trimester (typical range: 1,400 to 53,000 mIU/mL) and settle into a lower range for the third trimester (940 to 60,000 mIU/mL). This decline is completely normal and does not signal a problem with the pregnancy.
hCG in Non-Pregnant Individuals
For premenopausal women who are not pregnant, a normal hCG level is below 5 mIU/mL. Anything at or above 5 is generally considered a positive result. For postmenopausal women, the picture is slightly different. The pituitary gland produces small amounts of hCG when estrogen levels are low, so up to 8% of postmenopausal women over 55 will test above that standard 5 mIU/mL cutoff without being pregnant or having any medical concern. For this age group, the American College of Obstetricians and Gynecologists recommends using a cutoff of 14 mIU/mL instead.
What Slow-Rising hCG Levels Can Mean
When hCG rises more slowly than expected, or begins to plateau or drop in early pregnancy, it can point to two possibilities: an early pregnancy loss (miscarriage) or an ectopic pregnancy, where the embryo implants outside the uterus, usually in a fallopian tube. Neither can be diagnosed by hCG alone. Ultrasound and clinical evaluation are needed alongside the blood work.
An hCG level that falls outright in the first trimester typically signals a miscarriage that is already underway. A level that rises, but sluggishly, is the pattern that raises concern for ectopic pregnancy and usually prompts further imaging.
Unusually High hCG Levels
Levels that run well above the expected range for a given week can have a few explanations. The most common is simply a twin or higher-order pregnancy. Research in fertility patients found that an initial hCG above roughly 270 mIU/mL (measured around the time of the first positive blood test after embryo transfer) was a useful marker for distinguishing twin from singleton pregnancies, though many twins still fall below that number.
In rarer cases, very high hCG can indicate a molar pregnancy, a condition in which abnormal placental tissue grows instead of a normal embryo. Molar pregnancies produce hCG at abnormally elevated levels and are typically identified through ultrasound and confirmed with blood work. After treatment, hCG levels are monitored until they return to normal to make sure no abnormal tissue remains.
How Long hCG Takes to Clear After Pregnancy Ends
After a full-term delivery, miscarriage, or termination, hCG doesn’t vanish overnight. A study of 443 women who experienced miscarriages found that hCG dropped by 35 to 50% within 2 days and by 66 to 87% within 7 days. That’s a significant decline, but it still means a home pregnancy test can show positive for a week to several weeks after the pregnancy has ended.
The higher your hCG was at its peak, the longer it takes to fall below that 5 mIU/mL threshold. After a first-trimester loss, most people will see levels return to zero within a few weeks. After a full-term delivery, it can take four to six weeks. If you’re tracking your levels after a loss and they plateau or start rising again, that warrants a follow-up with your provider.
Why Lab Results Vary Between Tests
Different laboratories use different testing methods and calibration standards, so an hCG of 1,200 at one lab might come back as 1,050 or 1,350 at another. For this reason, serial hCG measurements (the 48-hour repeat tests) should always be done at the same lab. Comparing results across different labs or mixing a home urine test with a blood draw can create confusion about whether levels are truly rising, falling, or holding steady.
Home pregnancy tests detect hCG in urine, but they only give a yes-or-no answer above a certain sensitivity threshold, usually around 20 to 25 mIU/mL. They cannot tell you your actual number. Only a blood test (called a quantitative hCG or beta-hCG) provides a specific measurement, which is what you need if tracking the trend matters.