Tests during pregnancy

 What tests are needed In my pregnancy?

 Pathology Tests

cute baby

In early pregnancy (usually following the first visit) tests are arranged to check for anaemia (full blood count and iron studies), thyroid function,  blood group, red cell antibodies, blood sugar check (for daibetes screening) Rubella (German measles) immunity, Hepatitis B, Hepatitis C, syphilis, HIV, Chicken pox immunity and urine infection. If these tests have already been done by your general practitioner can you please bring a copy of the results. I will give you a referral to Douglass Hanly Moir Pathology for these tests. Douglass Hanly Moir Pathology has collection rooms all over Sydney. You may need a Pap smear also.

Blood tests in later pregnancy (at 26 to 28 weeks) are taken to check for anaemia, red cell antibodies (if your blood group is Rhesus negative) and diabetes. There is also a swab check for Group B Streptococcus if a vaginal delivery is planned.

If you have Rh negative blood group and if you have no red cell antibodies as shown by your result you will be offered a prophylaxis Anti-D injection. This will be repeated at about 32 weeks and again after delivery if your baby is found to be Rhesus positive by cord analysis of blood blood collected at delivery.

Other tests may be necessary because of special considerations. If you are aware of any health issues, past medical problems (personal or in the family) that may have an impact on your pregnancy then please inform me.

Ultrasound Scans

I will scan your baby at each antenatal visit with my 4D ultrasound machine. There is no charge to you for this.

At 12 weeks you can have a nuchal translucency ultrasound scan to check for Trisomy 21 (Down syndrome), Trisomy 18 (Edwards’s Syndrome), Trisomy 13 (Palau’s Syndrome). A blood test to check certain hormone levels is also offered to increase the accuracy of the screening. The screening will identify about 92% of checked abnormalities. If the result is comes back as ‘high risk’ foetal chromosomal studies (CVS or amniocentesis) is recommended to check. A CVS or amniocentesis has a 1 in 200 – 300 risk of miscarriage.

There is now available a maternal blood test (Non-Invasive Prenatal Test (NIPT)) to check for Trisomy 21 (Down syndrome), Trisomy 18 (Edwards’s Syndrome), Trisomy 13 (Palau’s Syndrome) in your baby. The NIPT also checks for sex chromosome disorders and can check the sex of your baby. Checking for sex chromosome disorders and the sex of your baby is not possible with a NTS and serum.  It checks the DNA of your baby from your baby’s placental DNA present in your blood. It is much more accurate than the NTS and serum and reduces the lilelihood of needed an amniocentesis or CVS. It can be done as early as 10 weeks pregnancy. This test is not covered by Medicare and has an out of pocket cost of $520 or $900 depending on which lab you choose.

At 19 weeks a foetal morphology ultrasound scan is recommended to exclude foetal abnormalities and other problems that could complicate your pregnancy.

There may be extra external scans necessary such as with twins or other concerns about pregnany complications.

At each antenatal visit

We will give you a container so you can bring a urine specimen each visit. It will be checked for protein (a screening test for preeclampsia, urinary infections and more) and sugar (a screening test for diabetes). I have had a number of patients where the first sign of preeclampsia is protein in the urine, and this has been apparent with a normal range blood pressure. Urinary infection can be without the typical symptoms (asymptomatic). Regular urine checking for sugar diabetes with a blood screen at 28 weeks is more reliable in diagnosing diabetes in pregnancy than a single diabetes blood screen at 28 weeks as diabetes can have its onset before and 28 weeks and the one time blood test can be too late or miss later onset gestational diabetes.

See also Pregnancy care checklist in the Blog section of this website

Posted by Dr Gary Sykes on -

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