The pregnancy hormone called
HCG (human chorionic gonadotropin) begins to be secreted by the cells
surrounding the embryo from the moment the embryo settles in the intrauterine
layer called the endometrium (5-6 days after fertilization). The basis for
pregnancy tests is the detection of this pregnancy hormone.
As pregnancy progresses,
β-HCG, which gradually increases in the blood, begins to appear in the urine
after exceeding a certain threshold level, and makes the pregnancy test appear
positive in the urine. The pregnancy test from the blood also determines the
amount of B-HCG in the blood. For him, the blood test can detect the presence
or absence of pregnancy, even without delay in menstruation. The urine test
never reaches the reliability of the blood test. When the presence of pregnancy
is detected in the urine test, the possibility of inaccuracy is low; however,
when its absence is detected, the test should be repeated after a while
considering the possibility of early pregnancy. (In very early pregnancies, the
urine test may not show pregnancy. This may be very low for the blood test
too.)
The BETA-HCG hormone, which
is examined in the blood, is a valuable test used in the diagnosis and
follow-up of ectopic pregnancy, miscarriage, as well as in the detection of
pregnancies that cannot be detected by the urine test.
How long after the urine pregnancy test results?
Pregnancy test in urine can
not give results in the days immediately after intercourse. In order to give
correct results, it is necessary to wait until the menstrual delay occurs and
perform the test in those days.
The reason for this is that
pregnancy test in urine is based on the logic that pregnancy-related HCG
hormone is detected in the urine as a result of passing from the mother's blood
to urine. Pregnancy may occur with the relationship entered near the spawning
time. Even if a pregnancy occurs with a relationship close to the day of
ovulation, it takes 6-10 days for this pregnancy to progress to the uterus and
settle in the uterus. After settling in the uterus, the hormone HCG secreted
from pregnancy can pass into the blood of the mother. In fact, it may take a
few days for this hormone to pass into the mother's blood and then to the
mother's urine after pregnancy has settled in the womb. Because of all this, in
short, if pregnancy occurs after a close relationship to ovulation time, it
should take almost 15 days for the pregnancy secreted HCG hormone to pass into
the urine of the mother. This corresponds to the next menstrual period, that
is, if pregnancy has occurred, the time will be delayed.
Therefore, if a relationship
with a suspicion of pregnancy has been entered, a urine pregnancy test should
be performed when there is a delay in menstruation. If pregnancy does not occur
in this test, the test should be repeated 1 week later to increase reliability.
In this way, if the second test is carried out, the test reliability is 90% in
the first test and up to 95%.
It is more reliable if the
test shows positive (have pregnancy) than negative (no pregnancy).
Nevertheless, whatever the test shows, in any kind of menstrual delay, you
should consult a doctor because even if the test shows pregnancy, this may not
be a normal pregnancy, it may be an ectopic pregnancy. Even if the test shows
no pregnancy, you can become pregnant without noticing.
Diagnosis of pregnancy with ultrasound:
When the menstruation is
delayed by one week, that is, when the pregnancy is 5 weeks old, the
gestational sac can be seen with vaginal ultrasound; Pregnancy should be at
least 6 weeks old so that the abdomen can be seen with ultrasound (abdominal).
When blood pregnancy test
(BHCG) value reaches 1500, gestational sac can be seen with transvaginal
ultrasound. When the BHCG value reaches 2000-3000, the gestational sac can be
seen with ultrasound from the abdomen, it cannot be seen before.
A positive pregnancy test is
evidence of the presence of pregnancy in the body, but this pregnancy may not
be a normal pregnancy, it may be inside or outside the uterus (ectopic
pregnancy). Whether pregnancy is in the womb can only be determined by
ultrasound, pregnancy tests with urine or blood cannot be determined.
-INFORMING THE MOTHERS BEFORE PREGNANCY
-CORD BLOOD BANKING
-DOES THE AGE OF THE FATHER BRINGS SOME RISKSWITH ADVANCING AGES?
-MALE PREGNANCY SYMPTOMS
