What's this test for?

This test is ideal if you're experiencing unexplained fatigue, brain fog, mood changes, or muscle weakness that could be linked to amino acid imbalances. It's also useful if you're following a specific diet, have a family history of metabolic conditions, or want to check how well your body processes protein. Phenylalanine and tyrosine are building blocks your body needs for energy, mood, and brain function, so checking their levels can help explain symptoms tied to metabolism or nutrition.

What's included in this test?

This test measures two related amino acids that work together in your body's protein and brain chemical pathways. Checking both levels together gives a clearer picture of how well your body is converting and using these building blocks, which matters for energy production, mood regulation, and overall metabolic health.

What happens after I get my results?

Your results will show up in your online account, with each value's normal range clearly explained so you know exactly where you stand. If your levels fall outside the expected range, simple next steps like adjusting your protein intake, reviewing supplements, or retesting in a few months are usually enough, though very abnormal results may call for prompt medical attention. You can download a standard lab report anytime from your account, and the trends feature lets you track how your levels change over time if you retest later.

How should I naturally support healthy amino acid levels?

Eating enough protein-rich foods like eggs, dairy, meat, fish, and legumes is the simplest way to keep phenylalanine and tyrosine levels steady, since your body gets these amino acids from food. Staying hydrated and managing stress also help your body use amino acids efficiently, since chronic stress can drain the tyrosine your body needs to make mood-related brain chemicals. If you're on a restrictive or plant-based diet, combining different plant proteins throughout the day can help you get a full range of amino acids.

When will I get my results?

Results are typically ready within about 7 days of your lab visit. Once processed, they'll be uploaded directly to your secure online account, and you'll get a notification so you can log in and review them as soon as they're available.

Who should consider this test?

People noticing persistent fatigue, low mood, or trouble concentrating that hasn't improved with lifestyle changes may benefit from this test. It's also worth considering if you follow a restrictive diet, have a family history of metabolic issues, or want a baseline check of your amino acid status before making dietary or supplement changes.

What symptoms indicate I may need this test?

Common signs include ongoing tiredness, low motivation, difficulty focusing, low mood, or muscle weakness that doesn't have an obvious cause. Some people also notice these symptoms alongside changes in appetite or after switching to a new diet. If these symptoms persist, checking your amino acid levels can help rule out a nutritional or metabolic cause.

What does high phenylalanine mean?

A high phenylalanine result means your body has more of this amino acid than it typically needs, which can sometimes affect how your body processes protein. This can be related to diet, certain metabolic conditions, or how your body breaks down protein. Cutting back on high-protein foods temporarily and retesting can help clarify whether the elevation is diet-related or something that needs closer attention.

What does low tyrosine mean?

Low tyrosine can mean your body isn't getting or making enough of this amino acid, which may affect energy, mood, and focus since tyrosine helps produce important brain chemicals. This is often linked to low protein intake, high stress, or increased metabolic demand. Adding more protein-rich foods to your meals and reducing chronic stress are practical first steps before retesting.

How often should I retest?

If your first results are within the normal range and you feel fine, retesting once a year or whenever you make major diet changes is usually enough. If your levels were off or you're actively adjusting your diet or supplements, retesting every 2-3 months can help you track progress and confirm things are moving in the right direction.

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.

Phenylalanine & Tyrosine Test - Amino Acid Balance

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

[email protected]