Leukocytosis Blood Test

What is Leukocytosis?

Leukocytosis is an elevated white blood cell count in the blood, typically above 11,000 cells per microliter. It is caused by infections, inflammation, certain cancers like leukemia, physical or emotional stress, or immune system disorders. The Complete Blood Count (CBC) with Differential is the most important test for diagnosing leukocytosis and identifying which white blood cell types are elevated.

RECOMMENDED TEST Complete Blood Count / CBC (includes Differential and Platelets)
What's included
Fast & easy, results by email & SMS
No extra fees paid at the lab
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
Why Private MD Labs?
90-day money-back guarantee Lab order in minutes Save a trip to the doctor Low prices since 2005 Labs within 2 miles

What causes leukocytosis?

Leukocytosis is caused by infections (bacterial, viral, or fungal), inflammatory conditions like rheumatoid arthritis or inflammatory bowel disease, certain cancers such as leukemia or lymphoma, physical or emotional stress, allergic reactions, or medications like corticosteroids. Your body produces more white blood cells as a defense mechanism to fight off pathogens or respond to tissue damage. Sometimes leukocytosis can also result from bone marrow disorders that cause overproduction of white blood cells.

What is the best test for leukocytosis?

The Complete Blood Count (CBC) with Differential is the most important test for leukocytosis because it measures your total white blood cell count and breaks down the specific types of white blood cells that are elevated, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils. This detailed breakdown helps doctors determine whether your elevated white blood cell count is due to a bacterial infection (high neutrophils), viral infection (high lymphocytes), allergic reaction (high eosinophils), or a blood disorder like leukemia. The differential count provides critical information for identifying the underlying cause and determining the appropriate treatment approach.

When should I get tested for leukocytosis?

You should get tested if you have persistent fever, frequent infections, unexplained fatigue or weakness, night sweats, unexplained weight loss, or swollen lymph nodes. Testing is also important if you have a known inflammatory condition that needs monitoring, if you are experiencing symptoms of infection that are not improving, or if you have a family history of blood disorders. Since leukocytosis often has no obvious symptoms, routine blood work during physical exams can catch it early before complications develop.

What are the symptoms of leukocytosis?
Leukocytosis itself often causes no symptoms and is typically discovered through routine blood work. However, you may experience symptoms related to the underlying cause, such as fever, chills, fatigue, body aches, difficulty breathing, pain or tenderness in the affected area, night sweats, unexplained weight loss, or easy bruising and bleeding. Some people notice swollen lymph nodes, frequent infections, or a general feeling of being unwell. The specific symptoms depend on what is causing your white blood cell count to rise.
Who is at risk for leukocytosis?
Anyone can develop leukocytosis, but certain groups are at higher risk, including people with chronic inflammatory conditions like rheumatoid arthritis or Crohn disease, those with frequent or severe infections, individuals taking corticosteroid medications, smokers, people under significant physical or emotional stress, and those with a family history of blood disorders. People with weakened immune systems, cancer patients undergoing treatment, and those recovering from surgery or trauma are also more likely to have elevated white blood cell counts.
What happens if leukocytosis is left untreated?
Untreated leukocytosis can lead to serious complications depending on the underlying cause. Severe infections can spread to the bloodstream causing sepsis, a life-threatening condition. Chronic inflammation can damage organs over time. If leukocytosis is caused by blood cancers like leukemia, delayed treatment can allow the disease to progress, making it harder to treat. Extremely high white blood cell counts can cause leukostasis, where blood cells clump together and block small blood vessels, potentially leading to stroke, organ damage, or breathing problems. Early diagnosis and treatment of the underlying cause is essential.
Can leukocytosis be diagnosed with a blood test?
Yes, leukocytosis is primarily diagnosed with a blood test called a Complete Blood Count (CBC) with Differential. This test measures the total number of white blood cells in your blood and identifies which specific types are elevated. A white blood cell count above 11,000 cells per microliter is generally considered leukocytosis, though the normal range can vary slightly between laboratories. The differential count shows the proportions of neutrophils, lymphocytes, monocytes, eosinophils, and basophils, which helps your doctor determine what is causing the elevated count and whether additional testing is needed.
How is leukocytosis treated?
Treatment for leukocytosis focuses on addressing the underlying cause rather than the elevated white blood cell count itself. Bacterial infections are treated with antibiotics, while viral infections typically resolve on their own with supportive care. Inflammatory conditions may require anti-inflammatory medications or immunosuppressive drugs. If medications like corticosteroids are causing the elevation, your doctor may adjust the dosage or switch to alternative treatments. Leukocytosis caused by blood cancers requires specialized treatment including chemotherapy, targeted therapy, or stem cell transplantation. In some cases, no treatment is needed if the elevation is temporary due to stress or a minor infection.
How can I prevent leukocytosis?
While you cannot always prevent leukocytosis, you can reduce your risk by practicing good hygiene to avoid infections, managing chronic inflammatory conditions with your doctor, maintaining a healthy lifestyle with regular exercise and a balanced diet, avoiding smoking, managing stress through relaxation techniques or counseling, and getting recommended vaccinations to prevent serious infections. Regular check-ups and blood work can help detect elevated white blood cell counts early, allowing for prompt treatment of underlying causes. If you take medications that affect white blood cell counts, follow your doctor's monitoring recommendations carefully.
What can I do at home for leukocytosis?
At home, focus on supporting your overall health and addressing the underlying cause. Get plenty of rest to help your body recover from infection or stress, stay well-hydrated by drinking water throughout the day, eat a nutrient-rich diet with plenty of fruits and vegetables to support immune function, and practice stress-reduction techniques like meditation, deep breathing, or yoga. Avoid smoking and limit alcohol consumption, as both can affect white blood cell production. If you have an infection, complete the full course of any prescribed antibiotics. Monitor your symptoms and contact your healthcare provider if you develop fever, worsening symptoms, or new concerns.
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.
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

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
Testosterone 375 ng/dL
Demo results
Normal Optimal 400 - 1000 High
375 ng/dL

What this means

Your testosterone levels are slightly below the optimal range. While this is not necessarily cause for concern, it may contribute to occasional fatigue, reduced motivation, or lower muscle mass over time.

* 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.

Us vs. Them

Not overhyped or overpriced. Just comprehensive blood testing made simple and for everyone.

* 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.

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

Google reviews 505 reviews Next
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

Sample results

Sample image
For you & your coach Health insights Written in human language, backed by science.
Sample image
For you & your doc Classic lab report A familiar and comprehensive lab report.

Ask AI

Your 24/7 Lab Guide

Quick questions:

Which test is right for my symptoms?
What could be causing this?
When should I get tested?
A
Hi, I'm AI. I can help you find the right test, explain results, or prepare for your visit. What can I help with?
Just now
A
AI provides insights, not medical diagnoses.