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Triple Screen Test

Triple Screen Test

Triple Screen Test

Also Known as Triple Test, Multiple Marker Screening and AFP Plus The triple screen test is a maternal blood screening test that looks for three specific substances: AFP, hCG, and Estriol.

Estriol: estriol is an estrogen produced by both the fetus and the placenta

It is a non-invasive procedure done through a blood test with little to no known risk to the mother or developing baby.

It is very important to remember what a screening test is before getting one performed. This will help alleviate some of the anxiety that can accompany test results. Screening tests do not look only at results from the blood test. They compare a number of different factors (including age, ethnicity, results from blood tests, etc…) and then estimate what a person’s chances are of having an abnormality.

These tests DO NOT diagnose a problem; they only signal that further testing should be done.

The triple screen test involves drawing blood from the mother which takes about 5 to 10 minutes. The blood sample is then sent to the laboratory for testing. The results usually take a few days to receive.

What are the risks and side effects to the mother or baby?

Except for the discomfort of drawing blood, there are no known risks or side effects associated with the triple screen test.

The triple screen test is performed between the 15th and 20th week of pregnancy although results obtained in the 16th -18th week are said to be the most accurate.

All pregnant women should be offered the triple screen, but it is recommended for women who:

 

  • Have a family history of birth defects
  • Are 35 years or older
  • Used possible harmful medications or drugs during pregnancy
  • Have diabetes and use insulin
  • Had a viral infection during pregnancy
  • Have been exposed to high levels of radiation

 

The triple screen is measuring high and low levels of AFP and abnormal levels of hCG and estriol. The results are combined with the mother’s age, weight, ethnicity and gestation of pregnancy in order to assess probabilities of potential genetic disorders.

High levels of AFP may suggest the developing baby has a neural tube defect such as spina bifida or anencephaly.

However, the most common reason for elevated AFP levels is inaccurate dating of the pregnancy. Low levels of AFP and abnormal levels of hCG and estriol may indicate that the developing baby has Trisomy 21 (Down Syndrome), Trisomy 18 (Edwards Syndrome) or another type of chromosome abnormality.

Although the primary reason for conducting the test is to screen for genetic disorders, the results of the triple screen can also be used to identify:

It is important to remember the triple test is a screening test and not a diagnostic test. This test only notes that a mother is at a possible risk of carrying a baby with a genetic disorder. The triple screen test is known to have a high percentage of false positive results.

Abnormal test results warrant additional testing for making a diagnosis.

A more conservative approach involves performing a second triple screen followed by a high definition ultrasound. If the testing still maintains abnormal results, a more invasive procedure like amniocentesis may be performed. Invasive testing procedures should be discussed thoroughly with your healthcare provider and between you and your partner.

Additional counseling and discussions with a counselor, social worker or minister may prove helpful.

The triple screen is a routine screening that is not an invasive procedure and poses no risks to the mother or baby. The abnormal triple screen results often warrant additional testing. The reasons to pursue further testing or not vary from person to person and couple to couple.

Performing further testing allows you to confirm a diagnosis and then provides you with certain opportunities:

 

  • Pursue potential interventions that may exist (i.e. fetal surgery for spina bifida)
  • Begin planning for a child with special needs
  • Start addressing anticipated lifestyle changes
  • Identify support groups and resources
  • Make a decision about carrying the child to term

 

Some individuals or couples may elect not to pursue testing or additional testing for various reasons:

 

  • They are comfortable with the results no matter what the outcome is
  • Because of personal, moral, or religious reasons, making a decision about carrying the child to term is not an option
  • Some parents choose not to allow any testing that poses any risk of harming the developing baby

 

It is important to discuss the risks and benefits of testing thoroughly with your healthcare provider. Your healthcare provider will help you evaluate if the benefits from the results could outweigh any risks from the procedure.

 

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