What's this test for?

This test is ideal if you're experiencing muscle weakness, drooping eyelids, double vision, trouble swallowing, or fatigue that gets worse with activity. These symptoms can point to a condition where your immune system mistakenly attacks the connection between your nerves and muscles. The MuSK antibody test helps identify one specific cause of this type of muscle weakness, especially in people who don't test positive for the more common antibody linked to this condition.

What's included in this test?

This test measures a single, specific antibody that attacks a protein called MuSK, which plays a key role in how your nerves communicate with your muscles. When this protein is disrupted by antibodies, it can interfere with normal muscle function and lead to weakness. Because this antibody is fairly specific to one type of neuromuscular condition, testing for it can help narrow down the cause of unexplained muscle weakness.

What happens after I get my results?

Your results will show up in your account along with the normal range so you can see exactly where your value falls. If your antibody level is elevated, next steps typically involve tracking your symptoms closely and considering retesting to monitor changes over time, while a negative result may mean looking into other causes of muscle weakness. You can download a standard lab report straight from your account at any time. The trends feature also lets you compare this result to any future tests so you can see how things change.

How can I naturally support muscle and nerve health?

While antibody levels themselves aren't changed by lifestyle alone, supporting your overall muscle and nerve health can help you feel your best. Getting consistent, quality sleep and managing stress can reduce fatigue that makes muscle weakness feel worse. Gentle, regular movement (as tolerated) helps maintain muscle strength, and eating a balanced diet with enough protein, vitamin D, and B vitamins supports nerve and muscle function. Avoid overexertion, since pushing through fatigue can temporarily worsen symptoms in some people.

When will I get my results?

Results from this test are typically ready within about 7 days of your sample being collected. You'll get a notification once they're available, and you can log into your account to view the full report. If your situation feels urgent or your symptoms are severe, don't wait for results — seek medical care right away.

Who should consider this test?

This test is worth considering if you have ongoing muscle weakness, especially in your face, eyes, throat, or breathing muscles, that seems to worsen with activity and improve with rest. It's also useful if you've already tested negative for the more common antibody associated with this type of condition but still have symptoms. People with a family history of autoimmune conditions may also want to consider testing if they notice unexplained muscle fatigue.

What symptoms indicate I may need this test?

Common symptoms include drooping eyelids, blurred or double vision, difficulty chewing or swallowing, slurred speech, and weakness in your arms, legs, neck, or breathing muscles. These symptoms often get worse as the day goes on or after physical activity and improve with rest. If you're noticing this pattern, especially if it's affecting your face or throat more than other conditions typically do, this test may help identify the cause.

What does a high MuSK antibody result mean?

A high or positive result means your immune system is producing antibodies that target the MuSK protein, which can disrupt communication between your nerves and muscles. This is associated with a specific form of a neuromuscular condition and often explains symptoms like facial and throat muscle weakness. A positive result is a meaningful finding that should prompt closer symptom tracking and follow-up testing to confirm the pattern over time.

How often should I retest?

If your first result is positive or your symptoms are changing, retesting every few months can help you and any follow-up care track whether antibody levels are rising, falling, or staying steady. If your result is negative but symptoms persist, retesting later or looking into other tests may be more useful than repeating this one right away. Your trends dashboard makes it easy to line up results side by side over time.

What should I do if my results are abnormal?

If your result comes back positive, start by keeping a symptom journal to track when weakness happens and what makes it better or worse. Avoid overexertion and prioritize rest during flare-ups. Because this condition can affect breathing and swallowing in some cases, seek medical care right away if you notice sudden difficulty breathing or swallowing. Otherwise, use your results and report to guide a conversation about next steps and possible retesting.

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.

MuSK Antibody Test - Muscle Weakness Diagnosis

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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