About Our hCG, Total, Quantitative, Blood Test
Purpose of the test
This test serves two distinct roles: pregnancy monitoring and tumor marker tracking. In reproductive care, it helps figure out whether a pregnancy is progressing normally, or whether there is an ectopic pregnancy (a pregnancy implanted outside the uterus), a molar pregnancy (caused by abnormal fertilization), or whether a miscarriage is occurring. Elevated levels are seen when there are twins, triplets, etc. Decreased hCG levels occur if there is fetal death, incomplete miscarriage, or ectopic pregnancy. In oncology, it helps detect and monitor certain tumors that produce hCG in people who aren’t pregnant.
- Diagnosis: Ordered when symptoms like a missed period, pelvic pain, or abnormal vaginal bleeding raise questions about pregnancy status or a possible ectopic pregnancy.
- Monitoring: Serial hCG testing tracks how levels rise or fall over time, guiding decisions about pregnancy viability, treatment response in gestational trophoblastic disease (GTD; a group of tumors that develop from abnormal cells that would normally form the placenta), and recurrence of hCG-producing tumors.
When used as a tumor marker, hCG is most relevant for monitoring GTD in response to treatment or recurrence of the cancer. Because hCG isn’t normally present in men or non-pregnant women, even a low detectable level can matter. The National Cancer Institute describes hCG as a key marker used to diagnose and monitor GTD.
This test doesn’t diagnose a specific condition on its own. A number in isolation rarely tells the whole story. Your provider reads hCG results alongside ultrasound findings, symptoms, and other lab values.
What does our hCG, Total, Quantitative, Blood test measure?
The lab measures total hCG in your blood using an immunoassay, a method that uses antibodies that specifically bind to the beta subunit of hCG, resulting in the unique detection and quantification of this hormone. hCG levels begin to increase with embryo implantation, 5-7 days after fertilization. hCG has a second subunit (alpha subunit) that is not specific for determining pregnancy. The alpha subunit has the same structure found in other hormones, such as luteinizing hormone (LH), follicle-stimulating hormone (FSH), and thyroid-stimulating hormone (TSH), and may actually decrease during the initial stages of pregnancy. Measuring the beta subunit avoids cross-reactivity and gives a more accurate result.
The quantitative beta hCG test provides more than just a positive or negative result.
- Quantitative hCG (this test): Reports the exact hormone concentration in mIU/mL. It is useful in monitoring a pregnancy, identifying potential complications, post-miscarriage management, and used in fertility treatments. Due to its high sensitivity, it is useful in the early detection of a pregnancy. hCG is also used in the diagnosis of certain cancers.
- Qualitative hCG: Reports only positive or negative results, used for straightforward pregnancy confirmation when a number isn’t needed.
CLIA-certified labs detect hCG at levels above 5 mIU/mL. Blood hCG rises before urine hCG reaches the threshold that home tests can pick up. That’s why this blood test can detect a pregnancy approximately 10 days after conception, slightly sooner than a home urine test.
When should I get a hCG, Total, Quantitative, Blood test?
Consider testing if any of these apply:
- A missed period, breast tenderness, fatigue, nausea, or increased urination
- A positive home pregnancy test that you want confirmed
- Pelvic pain or vaginal bleeding in early pregnancy
- A suspected ectopic pregnancy or miscarriage
- Monitoring during fertility treatment or assisted reproduction
- A planned medical procedure or imaging that requires ruling out pregnancy
- A known or suspected diagnosis of GTD or a germ cell tumor
For routine screening: this test isn’t used for general population-level screening the way some other tests are. It’s ordered based on clinical need:
- Anyone with early pregnancy symptoms who wants confirmation
- Anyone undergoing fertility treatment, at intervals set by their care team
- Anyone being monitored for GTD or germ cell tumor recurrence, as set by a schedule from their oncology team.
How It Works
How to get tested
You can order this test through Testing.com without seeing a provider first. We connect you with CLIA-certified labs, including LabCorp and Quest Diagnostics, and you can compare tests by cost, turnaround time, and privacy before ordering. After you order, visit a nearby patient service center for the blood draw. You are notified by email that your results have been sent to your secure online account.
This test is offered through a provider’s office, clinic, or hospital lab. If your provider ordered it, the results go through their system, and timing depends on their portal.
Before the test
No fasting is required. Eat and drink normally before your appointment.
If you’re taking any fertility medications that contain hCG, such as Pregnyl, Novarel, or Ovidrel, those drugs can raise your hCG level and affect the results. Don’t stop taking them without guidance. Make sure your provider knows.
No other dietary restrictions apply. You can take this test at any time of day. If you’re on other prescription medications or supplements, mention them too. Certain drugs, including some anticonvulsants and antipsychotics, have been linked to interference in hCG assays. The presence of heterophile antibodies (non-specific antibodies that interfere with the test) can cause false positive or negative results.
During the test
A technician draws blood from a vein in your arm. The draw takes about two to three minutes. You’ll feel a brief pinch when the needle goes in.
The technician places a small bandage over the site. Keep it on for at least 15 minutes. Most people feel fine right away.
There’s very little risk to a blood draw. Mild bruising or soreness at the site is the most common side effect. Call your provider if you notice swelling, redness, or pain that doesn’t go away within a day or two.
After the test
Results are usually ready within one to three business days after the lab receives your sample. Through Testing.com, they appear in your secure online account with an email notification.
If a provider’s office ordered the test, ask their staff about their portal and typical turnaround.
What do my results mean?
Your hCG level rises quickly, almost doubling every couple of days after conception. These ranges can vary from lab to lab, but can also be dependent on age, gender, and health history. Overlapping results at different weeks are not uncommon due to the rate at which hCG rises. A single number rarely tells you everything. Two numbers taken 48 hours apart tell you much more.
| Gestational Age (from last menstrual period) | Typical hCG Range (mIU/mL) |
|---|---|
| 3 weeks | 5–72 |
| 4 weeks | 10–708 |
| 5 weeks | 217–8,245 |
| 6 weeks | 152–32,177 |
| 7 weeks | 4,059–153,767 |
| 8 weeks | 31,366–149,094 |
| 9 weeks | 59,109–135,901 |
| 10 weeks | 44,186–170,409 |
| 12 weeks | 27,107–201,165 |
| 13-16 weeks | 13,300-254,000 |
| 17-24 weeks | 4,060-165,400 |
| 25-40 | 3,640-117,000 |
| Non-pregnant women | Less than 5 |
| Healthy men | Less than 2 |
If your results show low or undetectable hCG
An hCG level below 5 mIU/mL is considered undetectable for pregnancy purposes. In non-pregnant women, that’s the expected result; and in healthy men, levels are typically below 2 mIU/mL.
If you were testing to confirm a pregnancy and your level is low or undetectable, you either tested before hCG had time to rise, or you’re not pregnant. If your last menstrual period was recent and you still suspect pregnancy, retest in three to five days. hCG rises fast in early pregnancy, and a level that’s undetectable today may be clearly positive within a week.
If your results show high hCG
A high hCG level in someone who isn’t pregnant, or a level much higher than expected for gestational age, can point to several things. Your provider will interpret the number in context.
In pregnancy, a level that fits the gestational week range is reassuring. A level that’s much higher than expected may prompt an ultrasound to check for a multiple pregnancy or, in some cases, GTD. In men and non-pregnant women, any detectable hCG warrants follow-up. It may point to a germ cell tumor or other hCG-producing condition. The National Cancer Institute’s ovarian germ cell tumor guidance notes that hCG is useful in evaluating these types of cancers.
False positives are rare but possible. Fertility medications containing hCG are the most common cause. Certain rare conditions, including pituitary hCG secretion, can produce low positive levels, too. Your healthcare provider will discuss with you if retesting is necessary.
If your results are rising, plateauing, or falling over serial tests
Serial testing is where quantitative hCG becomes most useful. In a healthy, early pregnancy, hCG roughly doubles every 48 to 72 hours, but then levels off around eight to ten weeks, after which the levels begin to fall (see chart above). The Mayo Clinic notes that a slower-than-expected rise, a plateau, or a falling level in early pregnancy may suggest a miscarriage or ectopic pregnancy.
These patterns don’t confirm a diagnosis on their own. Your provider uses them alongside ultrasound findings to guide next steps.
In GTD or germ cell tumor monitoring, a falling hCG level after treatment generally means the condition is responding. A level that stays flat or rises again may mean the tumor is still active or has come back. Your oncology team sets the testing schedule and reads trends over time.
FAQs
Sources
MedlinePlus. hCG Blood Test. National Library of Medicine.
MedlinePlus. Gestational Trophoblastic Disease. National Library of Medicine.
MedlinePlus. Hydatidiform Mole. National Library of Medicine.
National Cancer Institute. Gestational Trophoblastic Disease Treatment (PDQ). NIH.
National Cancer Institute. Testicular Cancer Treatment (PDQ). NIH.
National Cancer Institute. Ovarian Germ Cell Tumors Treatment (PDQ). NIH.