Urine or blood test … When you are impatiently waiting to get pregnant, it is tempting to have a pregnancy test after each unprotected intercourse. However, it takes a certain amount of time after fertilization for pregnancy to be detectable … When to take a pregnancy test and how to interpret the results? Our advices.
You would like to conceive a child with your spouse and have a slight late menstruation ? Are there any symptoms that even remind you of pregnancy? To resolve the doubt for yourself, you can first carry out a urine test, before making a blood test which will determine more precisely if you are expecting a child. We take stock.
Sold in pharmacies and supermarkets, urine pregnancy tests are easy to use at home. Generally, it is enough to place the “tester” in a bottle of freshly collected urine, or to keep it “under the jet” while you urinate then to wait a few minutes to read the result. Its manual is nothing complicated and in less than 5 minutes, it announces the color! A little pink dot, a little pink line … You are pregnant. There are even tests whose result could not be more clear since it is displayed in full: “Pregnant” or “Not Pregnant”. Urine pregnancy tests measure the concentration ofchorionic gonadotropin hormone (HCG) : present during pregnancy, it begins to be produced only after the implantation of the embryo in the uterus. This hormone is only detectable ten to twelve days after fertilization, depending on the sensitivity of the test, knowing that for fertilization to take place, you must first have ovulated … The date of ovulation varies from one woman to another, but we consider that on average, it takes place around the fourteenth day of menstrual cycle. Taking all of these points into account, it is recommended that you take your urine test on the first day of your next period, which is likely to be reliable. It is also preferable to take the test on waking because the first urine is more concentrated in hormones.
The “false negatives” (the test claims that you are not pregnant while you are) are the most common: very often, they are due to too early use of the test, which could not detect HCG, because it was produced in too small a quantity … To have a clear heart, wait a few days, then retest. As to false positives (they display that you are pregnant when you are not expecting a child), they have really become very rare these days. Generally, special conditions are necessary for this to happen: this can especially be observed after a miscarriage or termination of pregnancy. Why ? Because the HCG level remains high for several more weeks, which can cause the test to react incorrectly.
If your urine pregnancy test is positive, talk to your doctor or gynecologist. They may order a blood test to confirm your pregnancy. 100% reliable, this blood pregnancy test, performed in the laboratory, also provides information on the date of fertilization and therefore the progress of your pregnancy. It is based on the same principle, namely that it measures the level of hormone HCG, secreted from the early pregnancy and reaching its maximum between the 7th and 12th week (it then gradually decreases until the end of the pregnancy). In addition, there are two types of blood tests: The qualitative test simply indicates a positive or negative result. The quantitative test assesses the amount of HCG hormone. Dosing precisely the level of hormones also makes it possible to date the pregnancy. Note, a miscarriage or an ectopic pregnancy can be detected by measuring these HCG levels, which then increase less rapidly.
The pregnancy hormone, HCG, or chorionic gonadotropin hormone is secreted by the cells that cause the placenta from conception. First in the blood, the hormone HCG is then passed through the urine. This is the reason why blood tests and urine tests can detect it. Its quantity doubles every two days approximately until the twelfth week of pregnancy before falling, but remains detectable in the blood and urine throughout pregnancy. Just like urine tests, you can do blood tests as soon as the first days of late periods. The assay of the level of chorionic gonadotropin hormone (beta-hCG) carried out, this makes it possible to date the period of fertilization, and therefore to give an indication of the DPA or expected date of delivery, which will be further confirmed or refined by other medical examinations performed by the gynecologist. Many women therefore realize a urine pregnancy test for a first indication, because it tells you 99% whether or not you are pregnant, and then confirm the urine test with a blood test, reliable him at 100%, and which allows them to know more about the period of fertilization. In normal values, the HCG level is between 200 to 8,000 IU / l from the second week of pregnancy. thereafter, these rates will double every two to three days, reaching their maximum at the end of the first quarter, when we detect up to 250,000 IU / l.