Tuberculosis Blood Test & Lab Work

What is Tuberculosis?

Tuberculosis is a serious bacterial infection that primarily affects the lungs but can spread to other organs throughout the body. It is caused by Mycobacterium tuberculosis bacteria, which spread through airborne droplets when infected individuals cough or sneeze. The Culture, Blood test is the most important blood test for tuberculosis because it can detect the presence of Mycobacterium tuberculosis bacteria in the bloodstream, especially when the infection has spread beyond the lungs.

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What causes tuberculosis?

Tuberculosis is caused by Mycobacterium tuberculosis bacteria that spread through the air when an infected person coughs, sneezes, speaks, or sings. When you breathe in these tiny droplets containing the bacteria, they can settle in your lungs and begin multiplying, causing infection. While the bacteria primarily attack the lungs, they can travel through your bloodstream to other parts of your body, including your kidneys, spine, and brain, leading to more severe complications.

What is the best test for tuberculosis?

The Culture, Blood test is the most important blood test for tuberculosis because it directly detects Mycobacterium tuberculosis bacteria in your bloodstream, which is especially critical when the infection has spread beyond your lungs or when you cannot produce sputum samples. The Lysozyme test is also essential as it measures your immune system's response to the TB infection, with elevated levels indicating active disease and helping doctors monitor how well your treatment is working. The Angiotensin-Converting Enzyme (ACE) test helps assess the inflammatory impact of TB throughout your body and tracks treatment effectiveness. For tuberculosis affecting the pleural space around your lungs, the Complement Component C3, Pleural Fluid test confirms diagnosis by measuring your immune system's active response in that specific area.

When should I get tested for tuberculosis?

You should get tested if you experience persistent cough lasting more than three weeks, cough up blood or mucus, experience unexplained weight loss and loss of appetite, have night sweats that soak your sheets, or develop a fever with chills that lasts several weeks. Testing is especially important if you have been in close contact with someone diagnosed with TB, work or live in high-risk settings like healthcare facilities or homeless shelters, or have recently traveled to countries where tuberculosis is common. People with weakened immune systems from HIV, diabetes, or medications that suppress immunity should also get tested promptly if they notice any suspicious symptoms.

What are the symptoms of tuberculosis?
The primary symptoms of tuberculosis include a persistent cough lasting three weeks or longer that may produce bloody or discolored mucus, chest pain that worsens with breathing or coughing, and fatigue that does not improve with rest. You might also experience unexplained weight loss, loss of appetite, fever that comes and goes, chills, and drenching night sweats. When TB spreads beyond the lungs, symptoms depend on which organs are affected and can include back pain from spinal TB, blood in urine from kidney TB, or severe headaches from TB meningitis.
Who is at risk for tuberculosis?
People with weakened immune systems face the highest risk for tuberculosis, including those with HIV/AIDS, diabetes, kidney disease, or cancer, as well as individuals taking immunosuppressive medications for organ transplants or autoimmune conditions. Healthcare workers, people who live or work in crowded settings like prisons or homeless shelters, and those who abuse alcohol or drugs have increased exposure risk. Geographic factors also matter, as people born in or who frequently travel to countries with high TB rates in Asia, Africa, Latin America, and Eastern Europe face greater risk. Children under age five and adults over age 65 have weaker immune defenses that make them more susceptible to developing active TB disease after exposure.
What happens if tuberculosis is left untreated?
Untreated tuberculosis can destroy your lung tissue, causing permanent breathing problems and potentially fatal respiratory failure. The bacteria can spread through your bloodstream to attack your brain, causing TB meningitis with seizures and death, or infect your spine, leading to severe back pain and paralysis. Your kidneys, liver, and heart can also suffer serious damage from untreated TB infection. Beyond the devastating health consequences, untreated tuberculosis means you continue spreading the disease to family members, friends, and anyone you come in close contact with, creating a public health risk in your community.
Can tuberculosis be diagnosed with a blood test?
Blood tests play an important supportive role in tuberculosis diagnosis, though they are typically used alongside other tests like sputum cultures and chest X-rays. The Culture, Blood test can detect Mycobacterium tuberculosis bacteria in your bloodstream, especially valuable when the infection has spread beyond your lungs. Blood tests like Lysozyme and Angiotensin-Converting Enzyme (ACE) help monitor your immune system's response and the inflammatory impact of TB infection. For complete diagnosis, doctors usually combine blood test results with TB skin tests, interferon-gamma release assays (IGRAs), imaging studies, and sputum analysis to get a full picture of your condition.
How is tuberculosis treated?
Tuberculosis treatment requires taking multiple antibiotics simultaneously for at least six to nine months to completely kill the bacteria and prevent drug resistance. The most common first-line medications include isoniazid, rifampin, ethambutol, and pyrazinamide, which you take daily under medical supervision. Your doctor will monitor your progress with regular blood tests and chest X-rays to ensure the treatment is working and to watch for potential side effects like liver damage. It is absolutely critical that you take all medications exactly as prescribed for the entire treatment duration, even when you start feeling better, because stopping early can cause the bacteria to become drug-resistant and much harder to treat.
How can I prevent tuberculosis?
The most effective prevention is the BCG vaccine, which is commonly given to children in countries where tuberculosis is widespread, though it is less commonly used in the United States. If you live with or care for someone with active TB, taking preventive antibiotic therapy as prescribed by your doctor can stop latent TB infection from becoming active disease. Practical prevention includes avoiding prolonged close contact with people who have active TB, ensuring good ventilation in indoor spaces, wearing N95 respirator masks in high-risk settings, and getting tested regularly if you work in healthcare or have other risk factors. Maintaining a strong immune system through good nutrition, regular exercise, adequate sleep, and avoiding excessive alcohol or drug use also helps your body fight off TB infection.
What can I do at home to support tuberculosis treatment?
While home remedies cannot cure tuberculosis and you must take prescribed antibiotics, you can support your recovery by eating nutrient-rich foods high in protein, vitamins, and minerals to help your body fight the infection and rebuild damaged tissue. Getting plenty of rest, drinking lots of water, and avoiding alcohol and smoking are essential because these habits stress your liver and lungs, which are already working hard to heal. Practice good hygiene by covering your mouth when coughing, disposing of tissues properly, and isolating yourself from others during the first few weeks of treatment to prevent spreading the bacteria. Taking your medications with food can help reduce stomach upset, and keeping a medication diary helps ensure you do not miss doses, which is critical for successful treatment.
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 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.
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.
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* 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.

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Culture, Blood
Google reviews 505 reviews
$212 $165
What's included
Fast & easy, results by email & SMS
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
No extra fees paid at the lab

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