A tick bite can make you wonder if the tick carried Lyme disease or another illness. You can send the specimen to a public health or university program, or to a commercial laboratory that tests ticks.
A tick test can identify pathogens in the tick, but it cannot tell you if you became infected. Your symptoms, exposure risk, and medical testing remain more important for deciding whether you need care.
Where To Send a Tick for Testing
You may find tick testing through a state or county health department, a university research program, or a commercial laboratory. Before paying for a test, check what the lab detects, whether it identifies the tick species, and how you should use the results.
Public Health and University Programs
Your state or county health department may offer tick identification, surveillance, or referrals to participating laboratories. University entomology and public health programs sometimes accept specimens, especially during research or regional surveillance projects.
Availability, fees, eligible tick species, and turnaround times vary by location. A public program may identify a blacklegged tick without offering a pathogen test, or it may only test for diseases relevant to that region.
Commercial Tick-Testing Laboratories
Commercial laboratories accept mailed specimens and may test for Lyme disease and other tick-borne illnesses. Some offer panels for Borrelia, Babesia, Anaplasma, or additional diseases.
Examples of commercial services include TickCheck’s tick-testing program, Ticknology’s specimen guidelines, and IGeneX tick testing. Review each company’s collection instructions, fees, refund policy, and reporting language before ordering.
How To Check a Lab’s Methods and Reporting
Ask whether the lab uses microscopy, polymerase chain reaction, or another method, and whether it reports the tick species separately from pathogen findings. A positive result means the lab detected genetic material or another marker in the specimen, not that you have Lyme disease.
For patient blood testing, the CDC’s Lyme disease testing guidance recommends FDA-cleared antibody tests using a two-step process. That recommendation applies to diagnosing people, not proving that a tick caused an infection.
What Tick Test Results Can and Cannot Tell You
A tick test may provide useful information about the specimen and local pathogen surveillance. It cannot measure how long the tick was attached, whether transmission occurred, or whether you developed Lyme disease or another infection.
Why a Positive Tick Result Does Not Confirm Infection
An infected tick can carry Borrelia, the bacteria associated with Lyme disease, without transmitting it to you. A positive result cannot establish whether the tick fed long enough to transmit a pathogen or whether another tick caused a later illness.
Blacklegged ticks, sometimes called deer ticks, can carry more than one organism. Depending on geography, testing may look for Borrelia burgdorferi, Babesia, Borrelia miyamotoi, or organisms associated with hard tick relapsing fever, also called TBRF. Some laboratories include Bartonella, though the CDC has not established tick transmission of Bartonella.
Why a Negative Tick Result Does Not Rule Out Disease
A negative result may reflect the wrong tick, an inadequate specimen, a testing method with limited sensitivity, or a pathogen that was not included in the panel. You could also have been bitten by a different tick that was not recovered.
Do not use a negative tick result to dismiss symptoms or delay medical care. Tick testing can supplement your records, but it should not replace clinical evaluation.
Saving, Identifying, and Shipping a Tick
Remove the tick promptly with fine-tipped tweezers. Grasp it close to your skin, pull upward with steady pressure, and clean the bite area and your hands with soap and water.
Place the tick in a sealed container or bag according to the receiving laboratory’s instructions. Record the date and location of the bite, take a photo of the tick and bite area, and keep the specimen dry unless the lab specifically requests another method.
Follow the packaging and mailing rules exactly.
When Medical Testing Is More Useful Than Tick Testing
Medical evaluation becomes more useful when you develop symptoms or had meaningful exposure to a likely vector. Your clinician considers the bite history, geography, tick characteristics, physical findings, and test results rather than relying on a tick report alone.
Symptoms and Exposure That Guide Diagnosis
Possible Lyme disease symptoms include an expanding rash, fever, chills, headache, fatigue, muscle aches, joint pain, facial weakness, or nerve symptoms. Tell your clinician when and where the exposure occurred, whether the tick appeared attached, and whether you removed it.
Your clinician may also consider other infections, including relapsing fever, based on symptoms and travel or residence. The CDC explains how symptoms and exposure shape Lyme disease diagnosis.
Erythema Migrans and Clinical Diagnosis
An erythema migrans (EM) rash often expands over several days and may resemble a target, though it does not always have a classic bull’s-eye appearance. When a clinician recognizes erythema migrans in a compatible exposure setting, they may diagnose Lyme disease clinically without waiting for a blood test.
A small, immediate area of redness at the bite is common and usually differs from an expanding EM rash. Seek medical advice if the rash grows, feels warm or painful, or appears with fever or other symptoms.
Two-Step Antibody Testing
Lyme disease tests generally look for antibodies rather than the bacteria themselves. CDC-recommended two-step testing begins with an enzyme immunoassay, or EIA, and uses a second assay when the first result is positive or equivocal.
The second step may use a Western blot, or WB, or a modified two-EIA approach. Use FDA-cleared tests through a healthcare provider, especially because some direct-to-consumer panels may not follow recommended methods.
Understanding IgM, IgG, and Early False Negatives
Your immune system may need several weeks to produce detectable antibodies. Testing during the first few weeks can be falsely negative, particularly when an EM rash is present.
IgM and IgG results require timing and symptom context. IgM is generally interpreted during early illness, while IgG becomes more informative later.
Antibodies can remain detectable for months or years after treatment, so a positive result does not prove active infection. Conditions such as autoimmune disease can also complicate interpretation.
Next Steps After a Tick Bite
Prompt removal, accurate documentation, and symptom monitoring help you make better decisions. A clinician can assess whether preventive antibiotics are appropriate and whether symptoms suggest an illness other than Lyme disease.
Safe Tick Removal and Bite Documentation
Use fine-tipped tweezers to pull the tick straight upward without twisting, crushing, or applying petroleum jelly or heat. Clean your skin and hands afterward.
Write down the date, location, and estimated attachment time. Photograph the tick beside a ruler if possible, save it in a sealed container if you want identification, and monitor the bite area and your health for several weeks.
When To Discuss Preventive Antibiotics
Contact a healthcare professional promptly after removal if the tick may be a blacklegged tick, was attached for a substantial period, and the exposure occurred in an area where Lyme disease is common. Preventive antibiotic treatment is considered only for specific high-risk bites and is not appropriate for every tick bite.
Do not start leftover antibiotics based solely on a tick test. A clinician can assess the tick, exposure, medication safety, and timing.
When To Seek Prompt Care for Other Tick-Borne Diseases
Seek prompt care for fever, severe headache, weakness, confusion, breathing problems, unusual bruising, or a rapidly spreading rash. These symptoms may indicate anaplasmosis, human granulocytic anaplasmosis, babesiosis, ehrlichiosis, Rocky Mountain spotted fever, or tularemia.
Powassan virus does not have a specific antibiotic treatment and can cause serious neurologic illness. If symptoms continue after antibiotic treatment, ask for reassessment because another tick-borne disease or a different condition may need evaluation.
