Quick answer: Titer tests, QuantiFERON-TB Gold Plus tests, and non DOT physicals are three common employee health screenings. A titer test measures antibody levels to confirm immunity, a QuantiFERON-TB Gold Plus test detects tuberculosis infection through a single blood draw, and a non-DOT physical evaluates an employee’s overall fitness for a job not regulated by the Department of Transportation.
Hiring the right people is only part of building a healthy, compliant workforce. Before many employees can start, they need to prove they’re medically fit and free from certain infectious diseases—especially in healthcare, education, construction, and other hands-on industries.
That’s where three screenings come into play: the titer test, the QuantiFERON-TB Gold Plus test, and the non-DOT physical. Each serves a different purpose, but together they help employers reduce risk, meet compliance requirements, and protect both staff and customers.
If you manage hiring or workplace safety, understanding these three tests will help you build a smoother onboarding process and avoid costly compliance gaps. This guide breaks down what each test involves, who needs it, and why it matters for your organization.
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Need to order a drug test or other employee screening service today? Contact our knowledgeable support staff at 844-573-8378 or press on link to order now: https://workplacescreening.com/order-here/
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What is a titer test and who needs one?
A titer test is a blood test that measures the level of antibodies in a person’s blood. It tells you whether someone has immunity to a specific disease—either from a past infection or a previous vaccination.
In practical terms, the test detects the presence of antibodies and measures how much of them a person has. A positive titer means the individual has adequate immunity to a particular disease. A negative titer means there’s no detectable immunity, which often signals the need for a vaccination or booster.
According to CVS MinuteClinic, there are two types of immunity a titer test can reflect:
- Active immunity: Develops through vaccination or after a previous infection. The body produces antibodies that generally last for years or even a lifetime.
- Passive immunity: Transferred from another source, such as from mother to infant or through immune globulin. This protection is temporary, usually lasting weeks to months.
When is a titer test required?
Many schools, healthcare institutions, and specific employers require proof of immunity before someone can start. There are two ways to verify that immunity:
- Vaccination records that confirm when, where, and by whom a vaccine was given.
- Titer test results when those records aren’t available.
This makes titer testing especially useful for new hires who can’t locate old immunization paperwork. Rather than re-administering vaccines unnecessarily, a quick blood draw confirms whether protection already exists.
Common diseases checked through titer tests include measles, mumps, rubella, hepatitis B, and chickenpox (varicella). Healthcare workers are frequently required to show immunity to these conditions before patient contact.
Need to order a titer test or other employee screening service today? Contact our knowledgeable support staff at 844-573-8378 or press on link to order now: https://workplacescreening.com/order-here/
For more info on Titer Testing: Titer Testing
What do titer test results mean?
Titer results help determine whether:
- A vaccine successfully protected the immune system against a specific disease
- An immunization triggered a strong enough response
- A person had a past or recent infection, such as hepatitis or mononucleosis
A blood draw takes only a few minutes, and results are usually available within a few business days. For diseases like measles, mumps, and chickenpox, positive results are generally considered valid regardless of when the test was taken. If a first test shows weak immunity, an employer or school may require a vaccination followed by a second titer test.
How does the QuantiFERON-TB Gold Plus test work?
The QuantiFERON-TB Gold Plus test (often shortened to QFT-Plus) is a blood test that screens for infection with Mycobacterium tuberculosis, the bacteria that causes tuberculosis (TB). It belongs to a category of tests known as interferon-gamma release assays, or IGRAs.
Here’s the simple version: the test exposes a blood sample to proteins that mimic the TB bacteria. If the person has been infected, their immune cells release a substance called interferon-gamma (IFN-γ). A lab then measures that response using ELISA technology to determine whether the result is positive, negative, or indeterminate.
According to Quest Diagnostics, the QFT-Plus test does not distinguish between latent and active TB, and it cannot be used to monitor TB treatment. Instead, it works alongside risk assessments, chest imaging, and other evaluations to identify infection.
Need more info on QuantiFERON TB Test: Titer Testing
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Why employers choose QuantiFERON over the TB skin test
For years, the tuberculin skin test (TST) was the standard for TB screening. The QuantiFERON-TB Gold Plus test offers several practical advantages, which is why many employers and clinics now prefer it.
Per Quest Diagnostics, the benefits include:
- No reader bias: Results come from a lab, not a visual interpretation of a skin reaction.
- Unaffected by prior BCG vaccination: People who received the BCG vaccine (common outside the U.S.) can test accurately, whereas BCG can cause false positives on a skin test.
- Only one visit required: A skin test needs 2 to 4 visits, since the patient must return to have the reaction read. QFT-Plus needs a single blood draw.
- Reduced staff time and fewer unnecessary follow-ups caused by false-positive skin test results.
- One visit test vs. having to send employee to have skin test read.
For HR teams managing high hiring volumes, that single-visit convenience translates directly into a faster onboarding process and less scheduling friction.
Who needs a QuantiFERON-TB test?
TB screening is most common in healthcare, long-term care, education, and other settings where people work in close contact. The CDC states that an IGRA like QFT-Plus can be used in place of a skin test in nearly all situations where a TST would be recommended for adults. It’s also the preferred option for anyone who received the BCG vaccine or is unlikely to return to have a skin test read.
The test can be used for children aged 2 and older, though the skin test remains preferred for children under 2.
What does a non DOT physical include?
A non DOT physical is a comprehensive medical exam that evaluates an employee’s overall health and fitness to perform a specific job. The “non-DOT” label simply means the exam is not governed by the Department of Transportation, which sets strict standards for commercial drivers.
Because no federal agency regulates these exams, employers have flexibility. The content of a non-DOT physical can be customized to match the physical demands of the role—a major advantage for companies across different industries.
Who needs a non DOT physical?
Non DOT physicals are typically required for employees in non-safety-sensitive positions that still carry physical demands. According to Southern Nevada Occupational Health Center, this includes:
- Office workers
- Teachers and school staff
- Construction workers
- Manufacturing and warehouse employees
- Healthcare workers
Some employers require the exam as a condition of employment, while others schedule periodic physicals for existing staff. Requirements vary by employer, industry, and state, so it’s worth confirming your obligations before a new hiring wave begins.
What happens during the exam?
A thorough non-DOT physical usually takes about 30 to 45 minutes. While the exact components depend on the job, most exams include:
- Medical history review: A look at past and present conditions, medications, and surgeries.
- Vital signs: Blood pressure, heart rate, respiratory rate, and temperature.
- Physical examination: An assessment of the eyes, ears, nose, throat, heart, lungs, abdomen, and extremities.
- Vision and hearing tests: Evaluated based on the demands of the job.
- Musculoskeletal assessment: Range of motion, strength, and flexibility for physically demanding roles.
- Urine analysis: To evaluate kidney function and detect potential health issues.
Depending on company policy, a non DOT physical may also include a drug screening. Employers use the results to confirm an employee can safely and effectively perform their duties.
Why non DOT physicals matter for employers
These exams do more than check a box. They help identify underlying health issues before they lead to workplace injuries or accidents. They can also flag risks like high blood pressure or high cholesterol, giving employers a chance to direct staff toward early intervention.
The result is a safer, more reliable workforce—and fewer surprises down the road.
Need more information on non dot physical: Non Dot Physical
How these three screenings work together
Each test answers a different question about an employee’s health:
- A titer test confirms immunity to specific infectious diseases.
- A QuantiFERON-TB Gold Plus test screens for tuberculosis infection.
- A non DOT physical evaluates overall fitness for the job.
For employers in healthcare, education, and other high-contact fields, these screenings often appear together in a single onboarding package. Bundling them streamlines the process, reduces the number of separate appointments, and helps ensure your organization stays compliant with state and industry requirements.
Need to order a non dot physcial or other employee screening service today? Contact our knowledgeable support staff at 844-573-8378 or press on link to order now: https://workplacescreening.com/order-here/
Build a healthier, more compliant workforce
Titer tests, QuantiFERON-TB Gold Plus tests, and non-DOT physicals each play a distinct role in protecting your workplace. Understanding what they measure—and who needs them—helps you onboard new hires faster while reducing health and compliance risks.
If your company is preparing for a hiring wave, expanding into new markets, or simply tightening its compliance practices, now is the time to review your screening process. Partner with a trusted occupational health provider to design a screening package that fits your industry, your roles, and your budget.
Frequently asked questions
How long does it take to get titer test results?
A titer test requires a quick blood draw, and results are usually available within a few business days. Exact timing depends on the lab and location, so ask your provider what to expect.
Is the QuantiFERON-TB test better than a TB skin test?
For many employers, yes. The QuantiFERON-TB Gold Plus test requires only one visit instead of the multiple visits needed for a skin test, isn’t affected by prior BCG vaccination, and removes reader bias since results come from a lab. Choose QuantiFERON if convenience, accuracy, and a faster onboarding process matter most.
Does a non DOT physical include a drug test?
It can. A non DOT physical may include a drug screening depending on the employer’s policy, but drug testing is not an automatic part of every exam.
Who decides what a non DOT physical includes?
Because non-DOT physicals aren’t regulated by a federal agency, the employer largely decides what the exam covers. The content is usually tailored to the physical demands of the specific job, and state regulations may also apply.
Can these screenings be done together during onboarding?
Yes. Many providers Like Workplace Screening Intelligence, bundle titer tests, TB testing, and non-DOT physicals into a single onboarding package. This reduces the number of appointments and helps employers manage compliance more efficiently.
Need to order a drug test or other employee screening service today? Contact our knowledgeable support staff at 844-573-8378 or press on link to order now: https://workplacescreening.com/order-here/
What Our Customers Say about WSI
Jodi gave us a 5 star google review and said, It’s the dreaded FAA drug audit time and I wanted to be sure that my records were aligned with Workplace Screening and was contacted by Lisa Friedman to go over my questions… She was absolutely terrific, took the time to address my questions and made sure I had everything needed to present for the audit. Her personality, explanations, and the time she invested to go through my files with me was top notch. I didn’t feel rushed, she was attentive and thorough…thanks, Lisa, for your dedication!
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Need to order a drug test, alcohol test or other employee screening service? Contact our knowledgeable support staff at 844-573-8378 or press on link to order now: https://workplacescreening.com/order-here/