How Does a Pregnancy Test Work?
The announcement of pregnancy is a very intense moment in a woman’s life. Often the doubt is there, loaded with hope, but only the pregnancy test can provide confirmation. How does it work? Moreover, most importantly, how long does it take to have a pregnancy test?
Signs of Pregnancy
The first witness of pregnancy is the delay of menstruation. However, in women whose cycles are irregular, this sign is not necessarily the first. Some symptoms can be very early on: tightness of the breasts, tingling in the chest, nausea, increased sensitivity to certain odors (perfume, tobacco, food …), drowsiness, white loss, etc. However, the only way to be sure and certain is the hormonal dosage.
The Principle of Pregnancy Testing
As soon as fertilization has taken place, a hormone is secreted: HCG (Human Chorionic Gonadotrophin). Its role is to regulate the ovaries to prevent the rules from occurring and thus allow nidation (implantation of the egg in the uterus).
It is this hormone that is dosed during a pregnancy test because of its rate increases rapidly and sharply. As an indication, one week after fertilization, the HCG level doubles every two days during the first three months of pregnancy.
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How long does it take to have a pregnancy test?
HCG can be detected as early as ten days after fertilization, even before menstruation is delayed. However, it is recommended to do a pregnancy test only after 5 to 8 days of menstrual delay. Why ? To avoid mistakes and disappointments. Many pregnancies stop very quickly for very natural reasons (false early layers). A pregnancy test too early would give rise to false hopes. Some women have late ovulations in the cycle. As a result, the onset of HCG is also later. A test carried out too early here may conversely indicate the absence of pregnancy falsely.
Blood Pregnancy Test
The search for the hormone HCG in the blood is 100% reliable. He alone can confirm with total certainty the pregnancy. It is carried out in the laboratory, your doctor must make a prescription and it is refunded by the Social Security. Alternatively, you can use the urine test, available over the counter in the pharmacy.
The urinary pregnancy test
Many tests are sold in pharmacies without a prescription. They cost between 10 and 20 euros depending on the brand and are not reimbursed. It is necessary to read the instructions carefully and to respect it scrupulously.
In general, it is a need to bring the urine into contact with a reagent, which changes color as a function of the quantity of HCG present.
The positive response is very reliable (99%).
On the other hand, false negatives are possible. In other words, if the answer is negative, it may be advisable to repeat the test one week later, always on the very concentrated urine in the morning (do not drink much the night before or during the evening).
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