Bacterial Infection or Inflammation Blood Test

What is Bacterial Infection or Inflammation?

Bacterial infection or inflammation is a condition where harmful bacteria invade the body, triggering an immune response that causes symptoms like fever, pain, swelling, and fatigue. It is caused by pathogenic bacteria such as Staphylococcus aureus, Streptococcus species, Escherichia coli, and other organisms that overwhelm the body's natural defenses. The Complete Blood Count with Differential is the most important test for detecting bacterial infections because it measures elevated neutrophil levels that indicate active bacterial involvement.

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What causes bacterial infection or inflammation?

Bacterial infection or inflammation is caused by pathogenic bacteria that enter the body through breaks in the skin, respiratory passages, digestive system, or other entry points. Common culprits include Staphylococcus aureus (causing skin infections and pneumonia), Streptococcus species (causing strep throat and skin infections), Escherichia coli (causing urinary tract and digestive infections), Pseudomonas aeruginosa, and Salmonella species. When these bacteria multiply in the body, they release toxins that damage tissues and trigger your immune system to mount an inflammatory response, producing the characteristic symptoms of infection like redness, swelling, warmth, pain, and fever.

What is the best test for bacterial infection or inflammation?

The Complete Blood Count with Differential is the most important test for bacterial infection or inflammation because it reveals elevated neutrophil levels that specifically indicate bacterial involvement. When bacteria invade your body, neutrophils are the first immune cells deployed to fight the infection, so their increased numbers in your bloodstream serve as a clear marker of bacterial activity. This test provides a detailed breakdown of all your white blood cell types, allowing healthcare providers to distinguish bacterial infections from viral infections or other conditions based on the specific pattern of cell elevation. The CBC with Differential is essential for determining whether antibiotics are needed and for monitoring how well your body is responding to treatment.

When should I get tested for bacterial infection or inflammation?

You should get tested if you experience persistent fever above 100.4°F lasting more than 2-3 days, especially when accompanied by chills or night sweats. Other warning signs include severe pain or swelling in any body part, wounds that become increasingly red or produce pus, difficulty breathing with cough and chest pain, severe sore throat with white patches, or urinary symptoms like burning and frequent urination with cloudy or foul-smelling urine. Testing is particularly important if you have a weakened immune system, diabetes, or if symptoms worsen despite rest and home care, as early detection allows for prompt antibiotic treatment and prevents complications.

What are the symptoms of bacterial infection or inflammation?
Bacterial infections produce symptoms that vary depending on the affected body part but commonly include fever, chills, fatigue, and general malaise. You might notice localized redness, warmth, swelling, and pain at the infection site, along with pus or discharge if the infection involves the skin or mucous membranes. Respiratory bacterial infections cause cough with colored mucus, chest pain, and difficulty breathing, while digestive infections produce nausea, vomiting, diarrhea, and abdominal cramping. Urinary tract infections cause burning during urination, frequent urges to urinate, and cloudy or bloody urine, and systemic infections can lead to rapid heartbeat, confusion, and severe weakness requiring immediate medical attention.
Who is at risk for bacterial infection or inflammation?
People with weakened immune systems face the highest risk, including those with diabetes, HIV/AIDS, cancer undergoing chemotherapy, or taking immunosuppressive medications for autoimmune conditions or organ transplants. Other high-risk groups include infants and elderly adults whose immune systems are less robust, individuals with chronic diseases like kidney disease or heart failure, people who have recently undergone surgery or have medical devices like catheters or IV lines, and those living in crowded conditions like nursing homes or dormitories. Healthcare workers, people with poor nutrition, smokers, and individuals with skin conditions that compromise the protective skin barrier are also more susceptible to bacterial infections.
What happens if bacterial infection or inflammation is left untreated?
Untreated bacterial infections can spread from the initial site to surrounding tissues and eventually enter the bloodstream, causing a life-threatening condition called sepsis where the infection overwhelms the entire body. Localized infections can develop into abscesses requiring surgical drainage, destroy bone and joint tissue leading to permanent damage, or damage vital organs like the heart (endocarditis), brain (meningitis), or kidneys. Chronic untreated infections can cause scarring and loss of function in affected organs, and some bacteria can trigger autoimmune conditions where your immune system mistakenly attacks your own tissues. In severe cases, septic shock can cause multiple organ failure and death, making prompt diagnosis and antibiotic treatment essential.
Can bacterial infection or inflammation be diagnosed with a blood test?
Yes, blood tests are fundamental tools for diagnosing bacterial infections and inflammation. The Complete Blood Count with Differential detects elevated neutrophil levels that indicate bacterial involvement and distinguish bacterial from viral infections. Blood cultures can identify the specific bacteria causing the infection and determine which antibiotics will be most effective, while markers like C-reactive protein and erythrocyte sedimentation rate measure the degree of inflammation in your body. Additional blood tests may check for organ function to assess whether the infection has affected your kidneys, liver, or other systems. While blood tests provide crucial diagnostic information, they are often combined with physical examination, symptom assessment, and sometimes imaging or cultures from the infection site for complete diagnosis.
How is bacterial infection or inflammation treated?
Bacterial infections are primarily treated with antibiotics that kill or stop the growth of the specific bacteria causing your infection. Your healthcare provider selects the antibiotic based on the type and location of infection, starting with broad-spectrum antibiotics for serious infections and then adjusting based on culture results. Treatment duration typically ranges from 5-14 days depending on infection severity, and it is crucial to complete the entire antibiotic course even if you feel better to prevent antibiotic resistance. Supportive care includes rest, adequate hydration, fever-reducing medications like acetaminophen or ibuprofen, and pain management. Severe infections may require hospitalization for intravenous antibiotics, surgical drainage of abscesses, or removal of infected medical devices, while complications may need specialist care.
How can I prevent bacterial infection or inflammation?
Prevention starts with good hand hygiene, washing your hands thoroughly with soap and water for at least 20 seconds before eating, after using the bathroom, and after contact with potentially contaminated surfaces. Keep wounds clean and covered until healed, avoid sharing personal items like towels or razors, and maintain up-to-date vaccinations that protect against certain bacterial infections. Practice food safety by cooking meat thoroughly, washing produce, and avoiding cross-contamination in the kitchen. Strengthen your immune system through balanced nutrition, regular exercise, adequate sleep, and stress management. If you have diabetes or other chronic conditions, maintain good control to reduce infection risk, and seek prompt medical attention for any signs of infection before they become serious.
What can I do at home for bacterial infection or inflammation?
While home remedies cannot replace antibiotics for bacterial infections, supportive measures can help you feel better during treatment. Stay well-hydrated by drinking plenty of water, herbal teas, and clear broths to help your body flush out toxins and maintain immune function. Get adequate rest to allow your immune system to focus energy on fighting the infection, and use warm compresses on localized infections to increase blood flow and reduce pain. Take over-the-counter pain relievers and fever reducers as directed, eat nutritious foods rich in vitamins and minerals to support healing, and avoid alcohol and smoking which impair immune function. Monitor your symptoms closely and seek medical attention if fever persists beyond 2-3 days, symptoms worsen despite treatment, or you develop new concerning symptoms like difficulty breathing or confusion.
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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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Complete Blood Count / CBC (includes Differential and Platelets)
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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