What's this test for?

This test is ideal if you're experiencing developmental delays, feeding problems, or unusual muscle tone in a child, or if a doctor has raised concerns about a genetic syndrome affecting growth and behavior. It's also used when there's a family history of Prader-Willi or Angelman syndrome and you want a clear genetic answer. The test looks for a specific chromosome difference linked to both of these conditions.

What's included in this test?

This test uses a technique called FISH (fluorescence in situ hybridization) to look closely at a specific region of chromosome 15. This region is important because small missing or altered pieces of it are the most common cause of both Prader-Willi syndrome and Angelman syndrome. Looking at this one area gives a clear, targeted answer instead of a broad genetic scan.

What happens after I get my results?

Your results will be available securely in your account, with each finding explained in plain language so you understand what it means. If the test shows a genetic change linked to Prader-Willi or Angelman syndrome, the next step is usually genetic counseling and coordinated care planning based on the specific finding. A standard lab report is available to download directly from your account at any time. You can also revisit your results later through the trends feature to keep a personal record over time.

How can I naturally support a child's development while awaiting or after genetic results?

While no lifestyle change can alter a genetic condition, early developmental support like physical therapy, feeding therapy, and structured routines can make a real difference in day-to-day comfort and progress. Keeping consistent sleep schedules and engaging in simple sensory play can also help with mood and behavior regulation. These steps are helpful alongside genetic answers, not instead of them.

When will I get my results?

Results from this specialized genetic test typically take about 7 days to process. This is longer than routine blood work because the FISH technique requires careful lab analysis of chromosome samples under a microscope. You'll be notified as soon as your results are ready to view in your account.

Who should consider this test?

This test is a good option for parents or caregivers of a child with unexplained developmental delay, low muscle tone in infancy, or unusual feeding and growth patterns. It's also useful for adults or children with signs like severe speech delay, frequent laughter and hand-flapping movements, or excessive hunger and weight gain, which are hallmark signs of these two conditions. Anyone with a family history of either syndrome may also want this test for family planning purposes.

What symptoms indicate I may need this test?

In infants, signs can include very weak muscle tone, poor feeding, and slow growth. As a child gets older, symptoms of Prader-Willi syndrome often include constant hunger and weight gain, while Angelman syndrome symptoms often include delayed speech, balance problems, and a notably happy, excitable demeanor. If several of these signs are present together, this test can help clarify the underlying cause.

What is Prader-Willi/Angelman syndrome and why does it matter?

Both conditions are caused by changes in the same small region of chromosome 15, but they affect the body differently depending on which parent's copy of the gene is affected. Prader-Willi syndrome mainly causes constant hunger, weight gain, and developmental delays, while Angelman syndrome causes severe speech difficulties, seizures, and movement problems. Knowing which condition is present helps guide the right kind of therapy, feeding plans, and long-term support.

How often should I retest?

This is typically a one-time diagnostic test rather than something you repeat regularly, since chromosome differences like this don't change over time. Retesting is generally only considered if an initial sample was inconclusive or if a different family member later needs testing for family planning purposes. There's no need for routine retesting once a clear result is obtained.

What should I do if my results are abnormal?

If your results show a genetic change linked to Prader-Willi or Angelman syndrome, the most helpful next step is connecting with genetic counseling services and early intervention programs suited to the specific condition identified. Early therapies like feeding support, physical therapy, or speech therapy can meaningfully improve day-to-day outcomes. Keep a downloaded copy of your lab report handy, since it will be useful for coordinating any follow-up care or specialist referrals.

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.

Prader-Willi/Angelman FISH Test - Genetic 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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