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Why have a Glucose Test During Pregnancy?

There are several tests you need to have during pregnancy. One of them is a glucose test, also called a 1 hour GTT test. This is a blood sugar test that is checked one hour after giving you a 50 gram load of glucose at the doctor’s office. This test is generally checked at the 24th week of gestation but can be tested earlier than that if there is a high suspicion of gestational diabetes in the pregnancy.


There are a number of tests done at the first prenatal visit. At the first prenatal visit, a Pap test is done along with routine tests such as blood type, PPD test (a tuberculosis test or TB test), CBC, and HIV test. These screening tests can include another STD testing if a person is high risk for STDs. Things like a paternity test or genetic testing aren’t done until you are pregnant and in your second or third trimester.

There are several tests you need to have during pregnancy. One of them is a glucose test, also called a 1 hour GTT test. This is a blood sugar test that is checked one hour after giving you a 50 gram load of glucose at the doctor’s office. This test is generally checked at the 24th week of gestation but can be tested earlier than that if there is a high suspicion of gestational diabetes in the pregnancy.


There are a number of tests done at the first prenatal visit. At the first prenatal visit, a Pap test is done along with routine tests such as blood type, PPD test (a tuberculosis test or TB test), CBC, and HIV test. These screening tests can include another STD testing if a person is high risk for STDs. Things like a paternity test or genetic testing aren’t done until you are pregnant and in your second or third trimester.

Can you take a Pregnancy Test during implantation bleeding?

You can take a pregnancy test during implantation bleeding but a urine test will likely be negative. You need to have the HCG leach into the maternal bloodstream before a pregnancy test is positive. This can take up to a couple of days after implantation so testing then is more important. You can also take a pregnancy test during a period but, unless it is a false period, it will probably be negative. Talk to your doctor if you are having bleeding but have a positive pregnancy test because this could represent implantation bleeding, an ectopic pregnancy or a miscarriage.

Genetic Testing during Pregnancy

At around 11-13 weeks gestation, you can have a CVS test, which is also called chorionic villous sampling test. This is a test that will act as paternity testing, if necessary, a test for Down syndrome, and DNA testing for hereditary diseases, including a cystic fibrosis test. You can also have an AFP test early in pregnancy. This is a blood test that is part of screening tests for abnormalities of pregnancy, including Down syndrome. Chorionic villous sampling is not without risk. It involves going into the uterus and taking a piece of tissue from the growing placenta. The genetic details of the infant, including paternity testing, can be done on this sample of tissue.

As mentioned, 24 weeks or so is the time for a diabetes test. It is a simple blood test taken after you drink some glucose in solution. There is no need for a 24 hour urine test for glucose because, if the initial screening test is suspicious for gestational diabetes, a three hour test can be done to confirm or refute the diagnosis of gestational diabetes.

At around 35-37 weeks gestation, the doctor will take a swab of the cervix as a group B strep test. This is also called a gbs test or a strep B test. If the test is positive, you will have to have antibiotics during labor to reduce the risk of passing on group B strep to the infant at the time of delivery.
Toward the end of the pregnancy, you may have a non-stress test or an NST test. In this test, you are placed on a fetal monitor and will be asked to mark with a marker when you feel the baby move. The heartbeat should rise with fetal movements, indicating that the pregnancy is still healthy. If the test is inconclusive, further testing should be done.

Can you get a DNA test during pregnancy?

Through CVS testing or an amniocentesis, doctors can collect a sampling of fetal cells to be tested for a variety of diseases and for paternity if that is the issue. Many women over the age of 35 elect to have one of these tests so they can be sure that the fetus doesn’t have a genetic disease. There are more genetic diseases when the woman is over the age of 35 when she gets pregnant.

Can I take a pregnancy test during my period?

You can take a pregnancy test at any time you believe you might be pregnant. A positive pregnancy test with bleeding can be a normal part of some women’s pregnancies or it can mean you are having a miscarriage or an ectopic pregnancy. In such cases, there may be a very faint line on the pregnancy test and a quantitative blood HCG test will be very low. It will also fail to double within 48 hours, indicating that you are having problems with the pregnancy. A pregnancy test during miscarriage is usually still positive and will remain positive for a couple of weeks after the miscarriage is over.

Why do testing during pregnancy?

Not every woman has a lot of tests done during pregnancy but many need the routine screening tests for hemoglobin as well as a routine urine test at each visit. These tests allow the mother and the doctor to know whether or not there should be concern in the pregnancy. For example, if the gestational diabetes test is positive, the mother will have to check her sugars frequently and may need to be on insulin if the gestational diabetes is severe.

Things like nonstress tests and Beta Strep testing can change the outcome of the pregnancy. If the woman has a nonreactive nonstress test, she may go on to have testing that indicates she needs to go into labor sooner rather than later. If she tests positive for Group B strep, antibiotics are necessary for labor so the infant doesn’t get a strep infection after birth.

Genetic testing can be important if there is a family history of certain genetic disease or if there is a greater chance of a genetic disease because of the mother being over the age of 35 or in cases of the paternal age being high.

Talk to your doctor about having genetic testing as well as the other tests offered in pregnancy. While it seems like a lot of testings, it is important to know in advance if there is going to be some problems with the pregnancy so treatment can start early if possible.

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