Beta-hCG and Pregnancy Testing: Blood and Urine Tests, Timing and Interpretation

Beta-hCG and the pregnancy test rest on looking for a pregnancy-related hormone in the blood or urine. In IVF the test day is set by the doctor; a home test done before this day can be misleading, and a single value is not interpreted on its own. The information below offers a general framework and does not replace a diagnosis or treatment recommendation specific to the individual.

What is beta-hCG?

hCG (human chorionic gonadotropin) is a hormone produced after a pregnancy has begun. Pregnancy tests look for the beta subunit of this hormone. Because the level of the hormone changes over time, the result is not a diagnosis on its own but a part of the assessment.

What is the difference between a blood test and a urine test?

A urine test is a method that can also be done at home and shows the presence of the hormone. A blood test is done in the laboratory and can measure the level of the hormone; it can generally give a result earlier than a urine test and also makes it possible to follow the change over time. For these reasons a blood test is mostly preferred in IVF treatment.

Why is the pregnancy test in IVF done on the day the doctor states?

The test day varies with the developmental stage of the embryo, the type of transfer and your treatment plan. A test done too early may not yet show the hormone even if there is a pregnancy. The day your doctor states is chosen according to the time at which the result can be interpreted more reliably.

Why can an early home test be misleading?

An early home test can mislead in two directions. If the hormone level has not risen enough yet, the test can come out negative even if there is a pregnancy. On the other hand, an injection containing hCG given to trigger maturation can stay in the blood for a time and cause the test to look positive even if there is no pregnancy. For this reason, do not use the result of a home test done before the day your doctor states to decide on its own; what counts is the blood test done on the stated day.

What does a single value mean, and why is it repeated?

A single beta-hCG value does not by itself say whether the pregnancy is healthy or problematic. Because how the value changes over time matters, the test may be repeated after an interval. The values are interpreted together with ultrasound findings; if a pregnancy cannot yet be seen inside the uterus, the pregnancy may be very early, may not be developing, or may be an ectopic pregnancy; for this reason monitoring continues. A single value neither confirms nor rules out an ectopic pregnancy. Because a pregnancy formed with IVF can also be ectopic, pain and bleeding symptoms are taken carefully into account.

What is the next step if your test is positive?

A positive result shows that a pregnancy may have begun; it does not by itself guarantee that the pregnancy is inside the uterus and will progress healthily. Your doctor generally makes a plan for the value to be followed and for imaging with ultrasound. The values may not progress as expected; this could be an early pregnancy loss and is followed up together with your doctor. This is not a situation in which you simply wait and watch. Depending on the medicines used in treatment, increasing swelling of the abdomen, rapid weight gain or a decrease in the amount of urine may also be seen.

What should you do if your test is negative?

If the blood test done on the day your doctor stated is negative, you discuss the next step with your doctor. A negative result can be emotionally tiring. If your period is late or does not begin as expected, tell your doctor. Stopping the medicines you used during treatment also depends on your doctor's guidance.

Can you get support while waiting for the test result?

Waiting for the test result can be a difficult period; anxiety, restlessness and sleep problems are common. In this period it is appropriate to get support from those close to you or from a specialist.