Last Updated: September 2, 2026
HCG (human chorionic gonadotropin) is often called the pregnancy hormone, because it is made by cells formed by the placenta. Which nourish the egg after it is fertilized and attach themselves to the uterine wall. Levels can first be detected with a blood test around 11 days after conception and around 12 to 14 days after conception with a urine test.
Typically, hCG levels will double every 72 hours. The level will peak during the first 8 to 11 weeks of pregnancy, then decrease and stabilize for the rest of the pregnancy. If you’re learning about the early stages of pregnancy. You may also want to read about what to expect at two months pregnant.
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What you Need to know About your HCG Levels:
As your pregnancy progresses and your level rises, the time it takes to double may increase approximately every 96 hours.
Care should be taken when doing too many hCG tests. A normal pregnancy can have low levels of hCG and result in a perfectly healthy baby. The results of an ultrasound after 5 to 6 weeks of gestation are much more accurate than using hCG numbers alone.
An hCG level below 5 mIU/mL is considered negative for pregnancy, and any level above 25 mIU/mL is considered positive for pregnancy.
An hCG level between 6 and 24 mIU/mL is considered a gray area, and you may need to retest to see if your levels rise to confirm pregnancy.
The hCG hormone is measured in milli-international units per milliliter (mIU/mL).
A transvaginal ultrasound should be able to show at least one gestational sac once hCG levels have reached approximately 1,000 to 2,000 mIU/mL. Since levels can vary considerably and the date of conception can be incorrect, a diagnosis should not be completed using hCG levels or ultrasound results alone.
A single reading is not enough for most diagnostic purposes. When there are concerns about the health of the pregnancy, multiple hCG tests taken a few days apart allow for a more accurate assessment of the situation.
Also, hCG levels should not be used to date a pregnancy, as these numbers can vary widely.
There are two common types of hCG tests. A qualitative test detects whether hCG is present in the blood. A quantitative (or beta) test measures the amount of hCG actually present in the blood.
What does low HCG Mean?
A low hCG level can mean a number of things and should be rechecked within 48 to 72 hours to see how the level is changing. A low level can indicate:
- Pregnancy dating miscalculation
- Possible miscarriage or altered ovum
- Ectopic pregnancy
During pregnancy, maintaining overall physical well-being is also important. Pelvic floor exercises are another topic that expectant mothers may want to learn about as their pregnancy progresses.
Is a High Level of HCG Bad?
An elevated hCG level can also mean a number of things and should be monitored again within 48 to 72 hours to assess for level changes. A high level may indicate:
- Pregnancy dating miscalculation
- Molar pregnancy
- Multiple pregnancies
Should I Check My HCG Level Regularly?
It’s not common for doctors to regularly check your hCG levels unless you’re showing signs of a potential problem.
A health care provider can recheck your levels if you are bleeding, experiencing severe cramping, or have a history of miscarriage. For additional information about hCG testing and early pregnancy evaluation, you can also refer to the American College of Obstetricians and Gynecologists (ACOG).
A health care provider can recheck your levels if you are bleeding, experiencing severe cramping. Or have a history of miscarriage.
As pregnancy progresses, it’s also useful for parents to learn about other stages of caring for a baby. Including what temperature is considered a fever for a baby and choosing appropriate 6–9 month baby clothes.
