Washington Titer Testing

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Some Washington employers require antibody testing, also known as titer testing, as part of their pre-employment screening process. Existing employees may also be tested periodically as part of the process to ensure safety in the workplace, especially for industries such as healthcare or education. Titer testing is the first step to determining if someone is immune to certain diseases, such as varicella (Chickenpox), hepatitis A, hepatitis B, hepatitis C, measles, mumps, rubella, or COVID-19. If the antibody test indicates that an individual is not immune, Health Street can also provide services for vaccines and immunizations.

To register online for a titer test in Washington, simply click the "Register Now" button below. To schedule via phone or to contact us with questions regarding your antibody testing services, please reach us at (888) 378-2499.

Choose an Antibody Test in Washington

Assess a person's immunity to infectious diseases with the antibody testing options provided by Health Street in Washington. Find the right test for you below.

Hepatitis A Antibody Test

(starting at $179)

Assess hepatitis A immunity.


Hepatitis B Antibody Test

(starting at $199)

Determine immunity to hepatitis B.


Hepatitis C Antibody Test

(starting at $219)

Evaluate immunity to hepatitis C.


Triple Hepatitis Package

(starting at $549)

Test for immunity to hepatitis A, B, and C in one go.


MMR Titer

(starting at $249)

Check immunity to measles, mumps, and rubella.


Varicella Titer

(starting at $189)

Confirm immunity to Chickenpox (varicella virus).


Triple Antibody Package

(starting at $595)

Detect antibodies for hepatitis B, MMR, and varicella.


Total Antibody Package

(starting at $895)

Comprehensive antibody testing for hepatitis A, B, C, MMR, and varicella.


Search for Antibody Test By City, State, or ZIP

Overview of Washington Regulations

Washington Antibody Testing Regulations

The state of Washington generally does not mandate any vaccinations for adults, regardless of their profession. There are also no Washington antibody test regulations requiring individuals to provide proof of immunity to any disease.

While immunizations are not required, the Washington State Department of Health follows the U.S. Center for Disease Control and Prevention's (CDC) vaccination recommendations for adults aged 19 and over. This includes annual vaccinations for seasonal influenza and a Td (tetanus, diphtheria) or Tdap booster every 10 years.

The Washington State Adult Vaccine Program provides recommended vaccinations at no cost for adults who are uninsured or underinsured. Adults who take a Washington antibody test and find that they are not immune to certain vaccine-preventable diseases may want to consider taking advantage of this program.

There are no statewide vaccination requirements or Washington titer test regulations for college students. However, each institution has its own vaccination rules. While some only recommend certain vaccinations, others require students to provide proof of vaccinations to attend. Many institutions that require vaccinations will accept a titer test as proof of immunity to a specific disease instead of a vaccination record.

Colleges and universities offering group or on-campus housing must also provide students with information regarding meningococcal disease, including vaccination recommendations.

Washington Antibody Industry Regulations

With the exception of COVID-19, the state of Washington does not mandate vaccines for healthcare workers. However, Washington law states that employers must offer a no-cost hepatitis B vaccine series for all employees who have occupational exposure. Washington titer test regulations exclude employees who have had an antibody test proving that he or she is immune to hepatitis B.

In December of 2021, Washington Governor Jay Inslee issued Proclamation 21-14.3, requiring certain individuals to be fully vaccinated against COVID-19 and to submit proof of vaccination. This includes employees, on-site contractors, and on-site volunteers for:

State agencies
Operators of any educational setting
Operators of any healthcare setting
Health care providers

Hospice and in-home care providers are exempt from this requirement. There are also exemptions for disability and "sincerely held religious beliefs, practices, or observances" – unless providing the accommodation would place undue hardship on the employer.

The Equal Employment Opportunity Commission (EEOC) has stated that requiring a COVID-19 antibody test as a condition of employment is a violation of the Americans with Disabilities Act (ADA). Therefore, there are no federal or Washington antibody test regulations requiring COVID-19 titer tests for employment.

Relevant Washington Laws, Acts, and Legislation

§ 296-823-13005 and § 296-823-130 – employers must offer the hepatitis B vaccine series at no cost to all employees who have occupational exposure unless an exception applies.
RCW 70.54.370 – degree-granting public or private postsecondary residential campuses that provide on-campus or group housing (with the exception of community colleges and technical colleges) must provide information on meningococcal disease, including vaccination recommendations, to each enrolled matriculated first-time student. Community and technical colleges must provide this information only to students offered group or on-campus housing.
21-14.3 – requires certain workers to be fully vaccinated against COVID-19 and to provide proof of such vaccination.

Frequently Asked Questions

What is an antibody titer score?

To produce an antibody titer score, a person's serum is diluted and then retested for antibodies. If antibodies can still be detected, then the serum is diluted and then tested again. This process is repeated until the person's serum has been diluted as much as possible, but the presence of antibodies can still be detected.

What do titer tests test for?

A titer test is a blood test that is used to detect the presence of antibodies in the blood. The purpose of a titer test is to determine if a person has immunity against certain diseases. These results can be used to provide employers with proof of immunity, or to determine if a person needs to receive a certain vaccine.

What does a positive titer test mean?

If titer test results show that a person is positive, this may indicate that the individual has previously been infected with the disease or vaccinated against it. The individual may be presumed to have immunity against that specific disease, and vaccination may not be required at this time.


"WAC 296-823-13005." Washington State Legislature, https://app.leg.wa.gov/wac/default.aspx?cite=296-823-13005
"WAC 296-823-130." Washington State Legislature, https://apps.leg.wa.gov/wac/default.aspx?cite=296-823-130
"Immunizations – for Adults." Washington State Department of Health, https://doh.wa.gov/you-and-your-family/immunization/adult
"Recommended Adult Immunization Schedule." Centers for Disease Control and Prevention (CDC), https://www.cdc.gov/vaccines/schedules/downloads/adult/adult-combined-schedule.pdf
"Tri-Campus Immunity Verification Requirement." University of Washington, https://wellbeing.uw.edu/medical/immunizations/immunization-requirement/
"Returning to Campus – Vaccination Requirements." Pierce College, https://www.pierce.ctc.edu/vaccinated-campus
"Immunization Recommendations." Cougar Health Services, Washington State University, https://cougarhealth.wsu.edu/medical-clinic/immunization/
"RCW 70.54.370. Meningococcal disease – Students to receive information materials." Washington State Legislature, https://app.leg.wa.gov/rcw/default.aspx?cite=70.54.370
Talton, Sherry L. and Hamid, Noorin. "Washington State Continues to Mandate COVID-19 Vaccination for Certain Workers." The National Law Review, 1 December 2021, https://www.natlawreview.com/article/washington-state-continues-to-mandate-covid-19-vaccination-certain-workers
"For College Students and Administrators." Washington State Department of Health, https://doh.wa.gov/you-and-your-family/immunization/college-students-and-administrators
"State Immunization Laws for Healthcare Workers and Patients: WA, Centers for Disease Control and Prevention (CDC), https://www2.cdc.gov/vaccines/statevaccsApp/Administration.asp?statetmp=WA#290
"What You Should Know About COVID-19 and the ADA, the Rehabilitation Act, and Other EEO Laws." U.S. Equal Employment Opportunity Commission (EEOC), https://www.eeoc.gov/wysk/what-you-should-know-about-covid-19-and-ada-rehabilitation-act-and-other-eeo-laws
"Washington State Adult Vaccine Program." Washington State Department of Health, https://doh.wa.gov/public-health-healthcare-providers/public-health-system-resources-and-services/immunization/adult-vaccine-program
"21.14-3. COVID-19 Vaccination Requirement." State of Washington, https://www.governor.wa.gov/sites/default/files/proclamations/21-14.3%20-%20COVID-19%20Vax%20WA%20Amendment%20%28tmp%29.pdf?utm_medium=email&utm_source=govdelivery