What's this test for?

This test is ideal if you're experiencing unexplained fatigue that won't go away, frequent infections, or bone pain without a clear cause. It helps detect abnormal proteins in your blood that may signal immune system problems or conditions like multiple myeloma, a type of blood cancer. Many people use this test when they have concerning symptoms that haven't been explained by other tests, or when their doctor wants to rule out or monitor specific blood disorders.

What happens after I get my results?

You'll receive detailed doctor notes in simple language explaining what your free light chain levels and ratio mean for your immune system health. These notes include personalized recommendations on whether you need further testing, specialist follow-up, or ongoing monitoring, especially if abnormal protein patterns are detected. You'll also get the standard lab report and can track your light chain levels over time using our trends feature, which is particularly helpful if you're monitoring a known condition or following up after previous abnormal results.

What's included in this test?

This test measures Kappa Free Light Chains, Lambda Free Light Chains, Kappa/Lambda Free Light Chain Ratio, and Immunofixation (if reflex criteria are met). This test measures kappa and lambda free light chains, which are protein fragments produced by your immune system's plasma cells. The ratio between these two types helps identify abnormal antibody production that could indicate multiple myeloma, other blood cancers, or immune system disorders. If abnormal patterns are detected, the test automatically includes immunofixation, a specialized follow-up that identifies exactly which abnormal proteins are present and helps determine the specific type of condition affecting you.

How should I prepare for this test?

No special preparation is typically required for this test. You can eat and drink normally before your blood draw, and you don't need to fast. However, if you're taking any medications or supplements, let the lab know, as some substances can occasionally affect protein measurements. Your doctor may provide specific instructions based on your individual situation.

When will I get my results?

Most results are available within 3-5 business days after your blood sample reaches the lab. If your initial screening shows abnormal patterns and triggers the reflex immunofixation test, results may take 5-7 business days total since the additional testing requires specialized analysis. You'll receive a notification as soon as your complete results are ready to view.

Who should consider getting this test?

This test is important for people over 50 experiencing unexplained fatigue, bone pain, or frequent infections, as multiple myeloma risk increases with age. It's also valuable for anyone with a family history of blood cancers, those with kidney problems of unknown cause, or individuals with abnormal protein levels detected on routine blood work. Your doctor may order this test if you have anemia, high calcium levels, or other symptoms that suggest a plasma cell disorder.

What symptoms indicate I may need this test?

Common symptoms include persistent fatigue that doesn't improve with rest, unexplained bone pain especially in the back or ribs, frequent infections due to weakened immunity, and unexplained weight loss. You might also experience excessive thirst, confusion, or weakness if calcium levels are affected. Some people have no symptoms and discover abnormal protein levels through routine blood work, which is why screening can be important for those at higher risk.

What is multiple myeloma and why does monitoring matter?

Multiple myeloma is a blood cancer where plasma cells in your bone marrow grow abnormally and produce excessive amounts of abnormal proteins. These abnormal proteins can damage your kidneys, weaken your bones, and interfere with normal blood cell production, causing anemia and immune problems. Early detection through tests like free light chain measurements is crucial because catching myeloma in earlier stages allows for better treatment outcomes and helps distinguish it from less serious conditions that also cause abnormal protein levels.

What does an abnormal kappa/lambda ratio mean?

An abnormal ratio between kappa and lambda light chains suggests your body is producing too much of one type compared to the other, which isn't normal. This imbalance can indicate multiple myeloma, related blood disorders like smoldering myeloma, or other plasma cell problems. The degree of abnormality and which direction the ratio skews helps your doctor determine whether you need immediate treatment, closer monitoring, or additional testing to pinpoint the exact condition.

How often should I retest my free light chains?

If you've been diagnosed with multiple myeloma or a related condition, your doctor will typically monitor your free light chains every 1-3 months to track disease activity and treatment response. For people with MGUS (a benign condition that can precede myeloma), testing every 6-12 months is common to watch for progression. If your initial test was abnormal but you don't have a diagnosis yet, your doctor will determine the appropriate follow-up timeline based on how abnormal the results were and your other symptoms.

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.

Immune System & Myeloma Test - Unexplained Fatigue

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]

Blood Test for Unexplained Fatigue and Immune System Issues

Kappa/Lambda Light Chains, Free with Ratio and Reflex to Immunofixation

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

How should I prepare for this test?

What's included in this test?

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

Blood Test for Unexplained Fatigue and Immune System Issues

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

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