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Phosphate test for bone health, muscle weakness, and unexplained fatigue concerns

Blood Test for Muscle Weakness and Bone Health

Phosphate (as Phosphorus)

Google
3,138 reviews
  • Reveal the cause of muscle weakness
  • Diagnose bone health issues accurately
  • Clarify unexplained fatigue sources
First results as soon as overnight*

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

What's this test for?

This test is ideal if you're experiencing unexplained muscle weakness, bone pain, or persistent fatigue that won't go away. It helps identify mineral imbalances that affect bone strength, energy levels, and overall health, especially when combined with calcium testing. Many people use this test when they suspect nutritional deficiencies or kidney issues may be affecting their wellbeing.

How should I prepare for this test?

No special preparation is needed for this test. You don't need to fast before having your blood drawn, so you can eat and drink normally. Simply schedule your appointment at a convenient time and show up ready to have a quick blood sample taken.

What's included in this test?

Phosphate (As Phosphorus)

This test measures your blood phosphate levels, which work closely with calcium to maintain strong bones and teeth. Phosphate is essential for energy production in every cell, muscle function, and nerve signaling. Understanding your phosphate status helps identify potential issues with kidney function, vitamin D deficiency, parathyroid disorders, or nutritional imbalances affecting your overall health.

What happens after I get my results?
You'll receive detailed doctor notes in simple language explaining what your phosphate levels mean for your bone health, muscle function, and energy. These notes include personalized recommendations like dietary adjustments, vitamin D supplementation suggestions, or whether you should monitor kidney function. You'll also get the standard lab report and can track your phosphate levels over time using our trends feature to see how your nutritional changes are working.
Who should consider getting this test?
This test is valuable for people experiencing muscle weakness, bone pain, or chronic fatigue. It's also important for those with kidney disease, parathyroid disorders, vitamin D deficiency, or digestive issues affecting nutrient absorption. Anyone with unexplained symptoms or monitoring bone health conditions should consider this test.
What symptoms indicate I may need this test?
Common symptoms include persistent muscle weakness or cramps, bone pain or tenderness, unusual fatigue that doesn't improve with rest, and difficulty concentrating. You might also notice changes in appetite, unexplained weight loss, or feeling generally unwell. If you have kidney problems or are experiencing symptoms of vitamin D deficiency, this test can provide important insights.
How can I naturally support healthy phosphate levels?
Maintaining balanced phosphate levels starts with eating a varied diet including dairy products, lean meats, fish, nuts, and whole grains. Ensure adequate vitamin D through sunlight exposure or supplementation, as it helps regulate phosphate absorption. Staying well-hydrated and limiting excessive soft drinks or processed foods high in phosphate additives can help maintain healthy balance.
What is phosphate and why does it matter?
Phosphate is a mineral that combines with calcium to build strong bones and teeth. It's involved in how your body produces and stores energy, helps muscles contract properly, and plays a role in nerve function. Your phosphate levels need to stay balanced - both too high and too low can indicate health problems affecting your bones, kidneys, or metabolism.
What does high phosphate mean?
High phosphate levels, especially with low calcium, often suggest kidney problems or hypoparathyroidism. When both phosphate and calcium are high, it may indicate excessive vitamin D intake or milk-alkali syndrome. High phosphate can also result from excessive dietary intake or certain medications affecting mineral balance.
What does low phosphate mean?
Low phosphate levels can indicate malabsorption issues, vitamin D deficiency, hyperparathyroidism, or problems with kidney tubules. When both phosphate and calcium are low, it suggests your body isn't absorbing nutrients properly from food. Low phosphate may contribute to muscle weakness, bone pain, and fatigue.
How’s this work?
Getting your blood test with us is easy, private & backed by the power of science.

Long story short:
  1. In the test options, use the filters or search box to narrow your choices and find the test you want.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!
  8. If you have any questions, please text us at 754-799-7833 or email [email protected] 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 [email protected], and we'll gladly help you. We've got your back and reply quickly.
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 [email protected]. 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 [email protected].
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 [email protected].

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 [email protected] and we'll gladly help you.

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

You get clinical lab reports & simplified health insights.
Save time & gas, go straight to the lab. Our doctors cover the rest.
Results start landing the next day after your lab visit.*
We don’t sell or share your data. Your time & privacy matter.
US-licensed doctors have your back if things get unclear.
No hidden fees, nice discounts for regular checkups.
Save a trip to the doctor, go directly to the lab
Instant orders, results often overnight*
Results explained in simple language
Reviewed by US licensed doctors
Fast & confidential, we never sell or share your data
No insurance needed, transparent pricing
Demo results
Phosphate (As Phosphorus) 2.1 mg/dL
Demo results
Low Optimal 2.5 - 4.5 High
2.1 mg/dL

What this means

Your phosphate level is slightly below the optimal range. While this is not immediately dangerous, low phosphate can contribute to muscle weakness, fatigue, and reduced bone strength over time. This may be related to vitamin D deficiency, dietary factors, or absorption issues.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.
Here’s how easy it is to get blood work done on your terms
Choose a checkup
Order your test Save a trip to the doctor. Your results will come with clear, friendly explanations. Takes 2 minutes
Book a lab
Book an appointment Visit any of our 4,000 nearby lab locations to have your samples collected. Book or walk-in
Choose a checkup
Get results Receive a clear, easy-to-digest health report by email & SMS within a few business days. Get answers, fast

Blood Test for Muscle Weakness and Bone Health

Google
3,138 reviews
  • Reveal the cause of muscle weakness
  • Diagnose bone health issues accurately
  • Clarify unexplained fatigue sources

1,000,000+ blood tests later, here's what our customers say

Google reviews 3138 reviews Next
Still got questions? Text our super-cool support team at 754-799-7833 to get help finding your ideal checkup.