What's this test for?

This test is ideal if you're experiencing unexplained symptoms and a previous blood test showed a high total LD (lactate dehydrogenase) level that needs further investigation. It helps pinpoint which organ or tissue—like the liver, heart, muscles, kidneys, lungs, or blood—might be involved by breaking down LD into its five isoenzyme types. This is not used to check for a heart attack, so it's typically ordered when doctors need to sort out other causes of tissue stress or breakdown.

What's included in this test?

This panel breaks total LD down into five isoenzyme fractions, each tied to a different organ or tissue in the body. Looking at the pattern of these fractions—rather than just one total number—helps narrow down where in the body an issue might be happening, and can also detect a rare condition called macro-LD.

What happens after I get my results?

Your results will show up in your account with each isoenzyme level explained alongside its normal range, so you can see exactly which values are elevated. Depending on which isoenzyme pattern shows up, next steps might include retesting in a few weeks, adjusting lifestyle habits, or seeking care sooner if a value is significantly out of range. You can download a standard lab report straight from your account, and use the trends feature to track how your levels change over time.

When will I get my results?

Results are typically ready within about 7 days of your sample being collected. Once ready, they'll be uploaded directly to your secure online account where you can view, download, and track them.

Who should consider this test?

This test is a good fit for people who already have an elevated total LD result and need more detail on what's driving it. It's also useful for those with symptoms affecting the liver, muscles, kidneys, or lungs that haven't been explained by other testing. It is not the right test for suspected heart attacks.

What symptoms indicate I may need this test?

Symptoms like unexplained fatigue, muscle weakness, abdominal discomfort, jaundice (yellowing skin), unusual bruising, or breathing issues might prompt this kind of follow-up testing. These symptoms alone don't point to one specific cause, which is exactly why breaking LD into isoenzymes can help narrow things down. If you've already had a high total LD result and still have unanswered questions, this panel can add clarity.

How can I naturally support healthy LD levels?

Since LD elevations often reflect tissue stress rather than a lifestyle issue you can directly fix, general habits that support your liver, muscles, and kidneys can still help—like staying hydrated, avoiding excessive alcohol, eating a balanced diet, and getting appropriate rest between intense workouts (since heavy exercise can temporarily raise LD). Avoiding unnecessary muscle strain and giving your body time to recover after illness or injury also supports normal tissue turnover. If levels stay high, retesting and looking at other patterns is the next step rather than trying to fix it through diet alone.

What does high LD mean?

A high LD level generally means some type of tissue in the body is under stress or breaking down faster than normal—this could be muscle, liver, kidney, lung, or blood cells. The isoenzyme pattern helps show which tissue is most likely involved, since each type of cell releases a different ratio of LD fractions. On its own, a high result isn't a diagnosis—it's a clue that points toward further investigation.

What causes high LD isoenzyme levels?

Common causes include muscle damage from intense exercise or injury, liver conditions, kidney problems, certain blood disorders, and some lung conditions. Even things like a hard workout the day before your blood draw can temporarily bump up muscle-related LD fractions. Because so many things can raise LD, the isoenzyme pattern combined with other symptoms and test results helps narrow down the real cause.

How often should I retest?

If your results come back elevated, retesting in a few weeks (after avoiding hard exercise or other short-term triggers) can help confirm whether the pattern is persistent or was a temporary blip. If you're tracking a known condition, retesting every few months may make sense to watch the trend. Use the trends feature in your account to compare results over time and spot meaningful changes.

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.

LD Isoenzyme Panel - Tissue Damage Source Check

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]