What is a beta-hCG blood test, and why is it repeated?
Medically reviewed by our consultant obstetrician & gynaecologist (MBBS, MS OBG). Last reviewed: 2 November 2026.
A beta-hCG blood test measures the pregnancy hormone hCG in your blood and gives an exact level, not just yes or no. At Pai Hospital, Vaddem, Vasco-da-Gama, it is done in-house in the laboratory, which is open 24 hours, every day. Doctors often repeat it after 48 hours to see how an early pregnancy is progressing.
What does a beta-hCG blood test measure?
hCG (human chorionic gonadotropin) is a hormone made by the developing placenta soon after a pregnancy begins. The beta-hCG blood test measures it in a small sample of blood taken from the arm.
The test done at Pai Hospital is a quantitative beta-hCG. That means the report gives a measured level, not only "positive" or "negative". The level is what lets the doctor compare one test with the next.
How is a blood pregnancy test different from a urine test?
- Home urine test. Shows only yes or no, and only once the hormone in the urine is high enough for the strip to change colour.
- Beta-hCG blood test. Gives a number, can pick up a pregnancy a little earlier than most urine strips, and can be repeated so the doctor can see the trend.
A urine test is often enough to know you are pregnant. The blood test is asked for when the doctor needs more than yes or no: after fertility treatment, when periods are irregular, when there is pain or bleeding, or when an earlier test was unclear.
Why is the beta-hCG test repeated after 48 hours?
A single beta-hCG value tells the doctor that there is a pregnancy, but not much about how it is progressing. In a healthy early pregnancy the level generally rises steadily in the first weeks. The rise slows down later, so the pattern matters mainly in the early stage.
That is why the doctor often asks for a second test after 48 hours, sometimes a third. The two results are compared with each other, not with a number on the internet. A slower rise does not always mean a problem; it means the doctor will look more closely, usually with a scan once the level is high enough for the pregnancy to be seen.
A level that rises slowly, stays flat or falls can be a sign that the pregnancy is not continuing, or that it may be outside the womb (an ectopic pregnancy). Read about ectopic pregnancy. If you have pain on one side, fainting or heavy bleeding, do not wait for a repeat test; see pregnancy danger signs and go to the nearest hospital straight away.
When should I do a beta-hCG after IUI or IVF?
After IUI or an embryo transfer, the pregnancy test is usually done about two weeks later, on the day your fertility team gives you. Testing too early can be misleading. Some treatments use an hCG "trigger" injection to time ovulation, and that hormone can stay in the blood for some days and show up on a test even when there is no pregnancy.
After a positive result, a repeat test after 48 hours is common, along with progesterone if your doctor asks for it. Both are done in-house at the laboratory. To understand the steps before this point, read tests before IUI, what happens on IUI day and the IVF treatment timeline.
What should I know about the result?
There is no single "normal" beta-hCG number, because the level changes from day to day in early pregnancy and differs between women. The ranges are printed on your report. Your treating doctor reads the result together with the date of your last period, any treatment you have had and your repeat tests.
Very occasionally, hCG can be raised for reasons other than a pregnancy, or a pregnancy can be very early and not yet show clearly. This is another reason the doctor relies on the trend and on the full picture, not on one value.
When the pregnancy is far enough along, the doctor confirms its location and progress with an ultrasound scan as part of pregnancy care. We do not carry out or offer sex determination of any kind; it is prohibited by law (PCPNDT Act).
Where can I get a beta-hCG blood test in Vasco?
Beta-hCG is done in-house at the Pai Hospital Laboratory, on the ground floor inside Pai Hospital, Vaddem, Vasco-da-Gama. The laboratory is open 24 hours, every day, so the test can be done whenever your doctor asks for it, including on the day your fertility team gives you after IUI or IVF. The laboratory uses automated analysers, and quality-control samples are run every day before patient reports are released.
The beta-hCG report is usually ready within hours. Usually no fasting is needed for beta-hCG alone; if other tests are taken at the same time, some may need fasting. Call or WhatsApp the laboratory to check a test or ask about preparation before you come. See the full laboratory in Vasco page for the other tests done here, and blood test preparation and reports for how to prepare.
What happens after a positive test?
Once the pregnancy is confirmed, the next step is your first antenatal visit, where the doctor checks your health, plans your blood tests and explains how the pregnancy will be followed. Read your first antenatal visit to know what happens and what to bring.
Who explains my report?
Your treating doctor. Please do not start or stop any medicine based on the report alone. Written and reviewed by the Pai Hospital Team.
What is a beta-hCG blood test?
It is a blood test that measures hCG, the hormone made after a pregnancy begins. The quantitative test gives a number, so the doctor can see both whether there is a pregnancy and how much hormone there is.
Is a blood pregnancy test better than a urine test?
They answer different questions. A home urine test only says yes or no. A beta-hCG blood test gives a measured level, can pick up a pregnancy a little earlier, and can be repeated to follow an early pregnancy. Your doctor will tell you which one you need.
Why did my doctor ask me to repeat the beta-hCG after 48 hours?
One value on its own says little. In a healthy early pregnancy the level generally rises steadily in the first weeks. Comparing two results taken 48 hours apart shows the doctor how the pregnancy is progressing.
When should I do a beta-hCG after IUI or IVF?
Usually about two weeks after the IUI or the embryo transfer, on the day your fertility team gives you. A test done too early can be misleading, partly because some treatments use an hCG trigger injection. Follow the date your team gives you.
Is the beta-hCG test done at Pai Hospital itself?
Yes. Beta-hCG is done in-house at the Pai Hospital Laboratory, on the ground floor inside Pai Hospital, Vaddem, Vasco-da-Gama. The laboratory is open 24 hours, every day, and the report is usually ready within hours.
Do I need to fast for a beta-hCG blood test?
Usually no fasting is needed for beta-hCG alone. If other tests are taken at the same time, some may need fasting. Call or WhatsApp the laboratory to check before you come.
What is a normal beta-hCG level?
There is no single normal number, because the level changes from day to day in early pregnancy. The ranges are printed on your report, and your treating doctor reads your result together with the date of your last period, your treatment and any repeat test.
Who explains my beta-hCG report?
Your treating doctor. Please do not start or stop any medicine based on the report alone. If you have severe pain, fainting or heavy bleeding, go to the nearest hospital straight away rather than waiting for a repeat test.
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This page is for general education and is not personal medical advice. Treatment depends on your own examination and reports, so please speak to a doctor about your situation. We do not carry out or offer sex determination of any kind.