Amniocentesis Test in Ahmedabad: Diagnostic Testing for Your Baby

A screening test tells you the chance that your baby has a condition. A diagnostic test gives you the answer. CVS takes a tiny sample of placental tissue, and amniocentesis takes a small amount of the fluid that surrounds the baby. My maternal-fetal medicine training was at Fernandez Hospital, Hyderabad, and I do both tests under ultrasound guidance. Each takes only a few minutes, and you go home the same day.

Having the test is always your choice. Before you decide, I go through what the test can show, what it cannot, the risk involved and what options you would have afterwards.

The other fetal procedures I perform - fetal reduction, intrauterine blood transfusion and related treatments - are covered on my fetal therapy and IUT page.

CVS Test in Pregnancy and Amniocentesis: Two Ways of Sampling

CVS (chorionic villus sampling) collects chorionic villi - cells from the placenta - through a fine needle passed through the abdomen. These cells usually carry the same genetic make-up as the baby.

Amniocentesis draws off about 15–20 ml of amniotic fluid. The fluid contains cells shed from the baby's skin and urinary tract.

Depending on the question being asked, the sample can be tested for:

• Down syndrome, Edwards syndrome and Patau syndrome.
• Single-gene conditions such as thalassaemia, when the family's mutation is already known.
• Certain infections in the baby (amniocentesis only).

A diagnostic test answers only the questions it was designed to answer. A normal result is reassuring for the conditions tested, but it cannot exclude every problem - some heart conditions and developmental conditions that are not chromosomal will not show up. That is why the anomaly scan still matters after a normal result.

Situations in Which I Suggest a Diagnostic Test

• A higher-chance result on combined first-trimester screening or NIPT.
• An increased nuchal translucency, usually 3.5 mm or more.
• A structural finding on the NT scan, anomaly scan or fetal echo.
• Both partners carrying thalassaemia trait or another recessive condition, such as sickle cell disease.
• A known genetic condition in either parent, or an earlier baby with a chromosomal or genetic condition.
• A parent who carries a balanced chromosomal rearrangement.
• A suspected infection in the baby, such as CMV or toxoplasmosis, based on scan findings and the mother's blood tests.

Chorionic Villus Sampling vs Amniocentesis: Choosing Between Them

CVS gives an answer several weeks earlier. Amniocentesis is the better choice for some indications and for findings that appear later in pregnancy. The position of the placenta, the way the baby is lying and the week of pregnancy also affect which procedure is practical. To give a typical example: a high-chance NT result at 12 weeks usually leads to CVS, while a finding on the anomaly scan at 20 weeks usually leads to amniocentesis.

Amniocentesis Test in Which Month of Pregnancy?

The amniocentesis test is done from 15 weeks - the fourth month of pregnancy - and is most often carried out between 15 and 20 weeks. It is not done earlier because the procedure-related risk is higher before 15 weeks. When the reason is a finding on the anomaly scan at 18–22 weeks, it is naturally done a little later, usually within days of that scan.

CVS fills the earlier gap. It is done at 11–14 weeks, in the third month. This suits couples who already know of a genetic condition in the family, such as thalassaemia, or who have a higher-chance NT result at 12 weeks.

Timing also matters for decisions. The rapid QF-PCR result arrives in about 2–3 days, but a full karyotype or microarray takes 2–3 weeks. Under the MTP (Amendment) Act 2021, a medical board must approve any decision to end a pregnancy for a fetal condition after 24 weeks. So I plan the test early enough for results and counselling to come before that point.

What the Laboratory Tests on Your Sample

• QF-PCR - a rapid test for Down, Edwards and Patau syndromes and for the number of sex chromosomes, reported in about 2–3 days. The baby's sex is not disclosed.
• Karyotype - looks at all the chromosomes and detects larger rearrangements.
• Chromosomal microarray - detects small missing or extra pieces of chromosome; I often recommend it when the scan has shown a structural finding.
• Targeted gene testing - for a mutation already known in the family, such as beta-thalassaemia or spinal muscular atrophy.
• Exome sequencing - considered in selected cases, after counselling, when the other tests are normal.
• Infection PCR on amniotic fluid - for CMV, toxoplasmosis and other infections.

Getting Ready for the Procedure

Counselling always comes first. We go through why the test is being offered, what it can and cannot detect, and how long results take. We also discuss the risks of the procedure and the options open to you if a condition is confirmed. You may decide not to have the test - I respect that decision, and you will not be pushed either way.

Before the procedure I check:

• Your blood group
• Your HIV, hepatitis B and hepatitis C status.

If you or your partner carries thalassaemia trait, please bring both partners' reports and any earlier genetic reports, so that the laboratory tests for the correct mutation. You do not need to fast.

Amniocentesis Procedure: What Happens on the Day

1. I begin with a detailed scan of the baby, the placenta and the fluid, and map a clear needle path away from the baby and the blood vessels.
2. The skin is cleaned with antiseptic; a local anaesthetic may be used.
3. The sample is taken under continuous ultrasound and takes a minute or two.
4. Most women feel a brief pressure or a period-like cramp.
5. I check the baby's heartbeat afterwards, and you rest for a short while before going home.

Please bring someone with you and plan a quiet day rather than going back to work. In a twin pregnancy, each baby is sampled separately, with extra care to make sure every sample is matched to the right baby.

Procedure Risks and the Precautions I Take

• Miscarriage. When the procedure is done by a trained operator, the additional risk is about 0.5% or less, and possibly lower. Most miscarriages linked to the procedure happen within the first few days. I keep the needle under continuous ultrasound guidance and plan a single needle pass wherever possible.
• Leakage of fluid after amniocentesis happens in about 1–2% of cases and usually stops by itself.
• Serious infection is rare - fewer than 1 in 1,000 - and antiseptic technique lowers the risk further.
• Rh-negative mothers who are not already sensitised receive an anti-D injection within 72 hours.
• Not enough sample, or the culture fails to grow, in roughly 1 in 100 procedures; the procedure then has to be repeated.
• HIV or hepatitis B with a high viral load: the procedure carries a small risk of passing the infection to the baby, so I counsel these women carefully.
• Maternal cells: rarely, the result reflects the mother's cells rather than the baby's; laboratories check for this.

Most women who have CVS or amniocentesis go on to have an uncomplicated pregnancy.

After the Test: Recovery and Results

• Rest for the rest of the day, and avoid heavy lifting or strenuous exercise for a day or two.
• Mild cramping and light spotting can happen; paracetamol can be taken.
• Intercourse can usually resume after a few days, provided there is no bleeding or leakage.
• The QF-PCR result usually comes in 2–3 days, and I give it to you directly.
• A full karyotype, microarray or gene result takes about 2–3 weeks.

If a condition is confirmed, we meet again to talk about what the condition is, what the outlook may be and what options you have. These include continuing the pregnancy, with the birth and the baby's paediatric care planned ahead. The result can also guide early testing in a future pregnancy, or pre-implantation genetic testing with IVF.

Amniocentesis Test Cost in Ahmedabad: What Goes Into the Charge

I do not print a figure here; the hospital gives current charges on request. The total is made up of the procedure and the laboratory work, and it varies with:

• CVS or amniocentesis - the two procedures are charged separately.
• The laboratory tests chosen - rapid QF-PCR alone, a full karyotype, chromosomal microarray, a targeted gene test such as for beta-thalassaemia, exome sequencing or infection PCR. This is usually the biggest variable.
• Twins - each baby is sampled and tested separately.
• Anti-D - needed after the procedure if you are Rh negative and not sensitised.
• Counselling and scans - the counselling visit and the detailed scan before the procedure.

Before the test, I tell you which laboratory tests I am advising and why, so that you can ask the hospital for the charge of exactly that combination.

Your Diagnostic Testing Pathway in Five Steps

1. Counsellingwhy the test is suggested, which test suits you, the risks and the options, explained in Gujarati, Hindi or English.
2. Checks before the procedureblood group, infection status and the family's genetic reports.
3. Ultrasound mappinglocating the baby, the placenta and a clear needle path.
4. Samplingthe needle sample under continuous ultrasound, a heartbeat check and a short rest.
5. Resultsrapid results within days and full results in 2–3 weeks, discussed with you in person.

When to Ask Me About CVS or Amniocentesis

• Your NT scan, blood screening or NIPT has reported a higher chance.
• The anomaly scan has shown a structural finding.
• Both of you carry thalassaemia trait or another genetic condition.
• An earlier baby had a chromosomal or genetic condition.
• A scan suggests the baby may have an infection.
• You would like to understand the difference between screening and diagnostic testing.

Amniocentesis and CVS: Myths and the Reality

Questions Patients Ask Me About Amniocentesis and CVS