What's this test for?

This test is ideal if you're concerned about Williams syndrome, a genetic condition that can cause distinctive facial features, heart problems, developmental delays, and an unusually social personality. It's often considered for children or infants showing signs like feeding difficulties, delayed growth, or heart murmurs, or when a family member has already been diagnosed. Testing can help confirm or rule out a genetic cause behind these symptoms.

What's included in this test?

This is a FISH (Fluorescence In Situ Hybridization) test, a specialized genetic technique that looks directly at chromosome 7 to detect the small missing piece of genetic material associated with Williams syndrome. Unlike blood chemistry panels, this test doesn't measure multiple biomarkers — it's a targeted look for one specific genetic deletion. This precision matters because Williams syndrome symptoms can overlap with other conditions, so a direct genetic look gives a clear yes-or-no answer.

What happens after I get my results?

Your results will be available in your account, along with an explanation of what the finding means. Because this is a genetic test looking for a specific chromosome deletion, results are typically either positive or negative rather than a range of numbers. If the result is positive, next steps usually involve connecting with genetic counseling and additional specialist evaluations for heart, growth, and developmental support. You can download the full lab report from your account at any time, and your results remain saved in your account for future reference.

How can I naturally support my child's development if diagnosed?

While there's no natural remedy for the underlying genetic change, early support can make a big difference. Simple steps include early intervention programs for speech and motor skills, a heart-healthy routine if cardiovascular issues are present, and consistent developmental checkups to track growth and milestones. Building a calm, structured daily routine can also help with any sensory sensitivities that sometimes come with the condition.

When will I get my results?

Results are typically ready within about 7 days of your sample being processed at the lab. This timeframe allows for the detailed genetic analysis the FISH technique requires. You'll be notified as soon as your results are posted to your account.

Who should consider this test?

This test is a good option for infants or children with signs like poor feeding, slow growth, distinctive facial features, or heart murmurs. It's also worth considering if a close family member has been diagnosed with Williams syndrome, since the deletion can sometimes run in families. Parents who received an inconclusive result from a routine newborn screen may also want this more targeted test.

What symptoms indicate I may need this test?

Common signs that prompt this testing include unusual facial features such as a wide mouth and small upturned nose, low birth weight, feeding problems in infancy, developmental or speech delays, and an especially friendly, outgoing personality. Heart defects, particularly narrowing of blood vessels, are another common trigger for testing. If several of these signs appear together, genetic testing can help clarify the cause.

What is Williams syndrome and why does it matter?

Williams syndrome is a genetic condition caused by a missing piece of chromosome 7 that affects how the body and brain develop. It matters because early detection allows families to start supportive therapies and monitor for related health issues, especially heart and blood vessel problems, before they become serious. Knowing the diagnosis early also helps set realistic expectations and connect with the right resources sooner.

What should I do if my results are positive?

A positive result means the genetic deletion linked to Williams syndrome was found. Practical next steps include scheduling a heart evaluation, starting developmental and speech therapy assessments, and connecting with support groups for families managing the condition. If any severe symptoms like breathing difficulty or signs of heart distress appear, seek medical care right away.

How often should I retest?

This is a one-time diagnostic test, since the genetic deletion causing Williams syndrome does not change over time. There's generally no need to repeat the test once a clear result is obtained. If a first test was inconclusive, your results explanation will note whether a repeat sample or alternate test type is recommended.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

Williams Syndrome FISH Test - Genetic Deletion Screening

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

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