How Long Do Lyme Disease Blood Test Results Take?

Lyme disease blood test results often take 1–3 business days, but some reports take 7–21 days.

Waiting on test results can mess with your head. You might be staring at a calendar, replaying a tick bite, and wondering what each day means for your health. This page gives you a clear timeline for how long Lyme disease blood test results take and what to do while you wait.

If you searched “how long do lyme disease blood test results take?” you’re not alone. The answer depends on the lab method, whether the sample stays local or gets shipped out, and what your clinician ordered. You’ll see the usual ranges first, then the details that change the clock.

How Long Lyme Disease Blood Test Results Take At Most Labs

For many routine Lyme antibody blood tests, results post in one to three business days after the lab receives the sample. That’s common when the first-step screen is run in-house and the lab has daily batches.

Turnaround can stretch to a week or longer when the lab needs a second-step confirmation test, when your sample is sent to a reference lab, or when the lab runs Lyme testing only on set days. Public health labs can take longer still when volumes rise, and some send-outs run into the two-to-three-week range.

Expect 1–3 business days — Many in-house antibody screens and some full panels.
Plan for 4–7 business days — Common when confirmatory testing is added or shipping is involved.
Allow 8–21 days — Seen with public health or specialty reference lab workflows.

The wait you feel starts the moment blood is drawn, but the lab clock often starts later. The ordering clinic may take hours to courier samples, and some labs only “accession” specimens once or twice per day.

Ask for the specimen receipt date and the report release date directly from the lab.

What Makes The Wait Longer Or Shorter

Lyme testing is not one single test. It’s a set of steps that can shift based on your symptoms, timing since possible exposure, and the lab’s standard process.

Ask if it’s local or send-out — Local labs can post results faster than shipped specimens.
Watch the weekday timing — Friday draws can sit over the weekend before the next run.
Expect reflex testing after a reactive screen — Extra steps can add time.
Ask when the lab runs Lyme assays — Set run days can add waiting.
Check what else was ordered — Extra tick-borne tests can add days.

You can often get a straight answer by calling the lab or the ordering clinic and asking two questions: whether the test is done on-site, and whether anything is sent to a reference lab. Those two points explain most delays.

Sometimes the lab can’t run the test on the first tube. A sample that clots when serum is needed, gets mislabeled, arrives warm, or leaks in transit can get rejected. That turns a three-day wait into a restart. If you see a portal note like “specimen quantity not sufficient” or “unable to perform,” call the clinic right away so a redraw gets set up. Ask whether fasting is needed; most Lyme antibody tests do not require it.

Two-Tier Testing And Other Lyme Blood Tests

Most Lyme blood testing looks for antibodies your immune system makes after exposure to the Lyme bacteria. In the U.S., many clinicians follow the CDC-recommended two-step process, which starts with an immunoassay and follows with a second test if the first one is positive or equivocal. That approach cuts down on false positives from look-alike antibodies.

Here’s the process in plain terms, with the usual effect on timing. When a lab does both steps in-house, the extra step can still land in the same one-to-three-day window. When the second step is a send-out, the report often lands later.

Run the first-step screen — The lab checks for Lyme antibodies with an EIA or similar assay.
Reflex to a second test — If the first test is reactive, the lab runs confirmatory testing.
Release the final interpretation — The report ties the steps together into one result.

If you want the official language, see the CDC page on two-step serologic testing for Lyme disease. It lays out when testing is most reliable and why early testing can miss infection.

Less common blood-based options can change timing. PCR tests look for bacterial DNA in certain samples, but for Lyme they’re not the standard blood test in most routine cases. Some labs also use a modified two-tier method that swaps the second-step immunoblot for another immunoassay, which can speed reporting in labs that offer it.

A Timeline Table From Exposure To Report

People often mix up two different clocks: how long antibodies take to appear, and how long the lab takes once your blood is drawn. The table below separates those ideas so you can map your own situation.

Where You Are In Time	What The Test Can See	Lab Turnaround
First days after a bite	Antibodies may not show yet	Often 1–7 days for results, with higher miss rate
2–4 weeks after symptoms start	Antibodies are more likely to show	Often 1–7 days, depending on reflex steps
More than 4–6 weeks in	IgG antibodies are more likely to be detectable	Often 1–7 days; some send-outs take longer

If your clinician is worried about Lyme and other tick-borne infections at the same time, labs may run separate assays with separate timelines. You might see one result post, then another a few days later.

When Results Mislead: Early Negatives And Old Positives

The toughest part about Lyme testing is that a fast result is not always a clear answer. Antibody tests depend on your immune system’s timing. Early in infection, your body may not have made enough antibodies for the test to pick up, even while symptoms are real.

The CDC notes that serologic assays can be falsely negative during the first four to six weeks after infection. MedlinePlus also warns that testing too soon can miss Lyme because antibody levels take weeks to build. You can read that plain-language note on Lyme disease tests.

Some reports split results into IgM and IgG. IgM tends to show earlier, but it can be noisy. Many labs warn that IgM immunoblot findings are meant for symptoms that started within 30 days. After that point, IgM can stay positive after the infection clears, and false positives rise. If your symptoms began more than a month ago, clinicians often put more weight on IgG patterns and the full set of findings. If your test was drawn within two weeks of a bite and came back negative, a repeat sample in 7–14 days may catch a rising antibody response.

Treat early negatives with care — A negative result soon after symptoms start does not rule out Lyme.
Ask about past Lyme — Antibodies can linger after prior infection and treatment.
Remember cross-reactivity — Some other infections can trigger similar antibody signals.

That’s why clinicians pair test results with your symptom pattern, geography, and tick exposure history. The blood test is one piece of the picture, not the whole story.

What To Do While You Wait For Results

Waiting does not mean doing nothing. A few simple moves can help your next appointment go smoother and can prevent missed details.

Write down dates — Note the bite date, rash date, fever onset, and when new symptoms started.
Take clear photos — If you have a rash, get photos in good light with a coin for scale.
Track daily symptoms — Use a short list: temperature, fatigue, joint pain, sleep, headaches.
Ask about the lab pathway — Find out if the sample is a send-out and when the lab runs Lyme assays.
Watch for red flags — New facial droop, stiff neck, chest pain, fainting, or severe shortness of breath needs urgent care.

If you’re feeling worse while you wait, call the clinic that ordered the test. A changing symptom pattern can change the next step, even before the lab report lands.

How To Read Your Report And Plan Your Next Step

Most lab portals show a result line, then a longer interpretation. Read the interpretation. It often tells you which step was positive and what the lab did next.

Scan for the test method — Words like EIA, ELISA, immunoassay, or immunoblot hint at the workflow.
Find the final call — Labs may list “negative,” “positive,” or “equivocal” for the two-step result.
Check timing notes — Some reports note that early infection can test negative.
Match to your timeline — Symptom timing matters as much as the number on the page.

If you’re still stuck on that timing question after you see your portal, it can mean the lab ran the first step and is still working on the next. Many portals update in pieces. A partial post does not always mean the lab is done.

Equivocal results can feel like a shrug. In practice, they often trigger repeat testing or follow-up questions about timing. If symptoms started recently, clinicians may retest in a couple of weeks so your immune response has time to rise.

Key Takeaways: How Long Do Lyme Disease Blood Test Results Take?

➤ Most routine Lyme antibody results post in 1–3 business days.

➤ Confirmatory steps and send-outs can push results to 7–21 days.

➤ Early testing can miss Lyme before antibodies build up.

➤ A positive result can reflect an older infection, not a new one.

➤ Dates, photos, and symptom notes help you act faster at follow-up.

Frequently Asked Questions

Can I speed up Lyme disease blood test results?

You can’t speed the chemistry, but you can shorten handoffs. Ask the ordering clinic where the test is run and whether it’s a send-out. If a local lab offers Lyme testing in-house, a new draw there can post sooner. Weekend timing can add idle days, so weekday draws often move faster.

Why did my portal show one Lyme result, then nothing?

Many systems post parts of the order as they finish. A first-step screen can post while a reflex test is still running or still in transit. Call the lab and ask if a second-step test was triggered. Ask for the expected “final report” date, not just the first result date.

What if I had a bull’s-eye rash and the test is negative?

A classic expanding rash can point to Lyme even when blood tests are negative early on. Antibodies may not be detectable yet. Tell your clinician the rash start date and share photos. Clinicians often treat based on the rash pattern and exposure history, then use testing later if needed.

Should I retest after a negative Lyme test?

Retesting can help when symptoms started recently or when the first test was done soon after exposure. Many sources note that antibodies take weeks to develop. Ask your clinician whether a repeat test in two to four weeks fits your timeline, or whether a different diagnosis better matches your symptoms.

Can antibiotics change my Lyme blood test result?

Antibiotics don’t erase antibodies right away, so serology can still turn positive after treatment begins. Early treatment can reduce bacterial load and may change how symptoms evolve, which can affect testing decisions. Keep a record of start dates and doses so your clinician can interpret results alongside timing.

Wrapping It Up – How Long Do Lyme Disease Blood Test Results Take?

Most people see Lyme blood test results within a few days, but reflex testing and send-outs can stretch the wait. The bigger wrinkle is timing: early infection can test negative before antibodies rise, and older antibodies can stay positive long after symptoms change.

If your symptoms are moving, stay in touch with the clinic that ordered the test, and keep clean notes on dates and changes. Those notes help your clinician choose the next step with fewer repeat visits overall.

Founder & Lead Editor

Mo Maruf

I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.

Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.