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WSLH Proficiency Testing

Wisconsin State Laboratory of Hygiene

About Us

About WSLH Proficiency Testing

WSLH Proficiency Testing provides reliable, affordable, and easy-to-use proficiency testing products with rapid access to results. As part of a public health lab,
your lab is our mission. Why choose WSLH PT as your primary or secondary PT provider? Download this one-page handout to share with your lab staff.

Experienced Med Techs on staff

Each of our proficiency testing programs has a dedicated Medical Technologist with at least 5 years of extensive instrument knowledge. 

Provider-Centered Customer SERVICE

No matter the size of your order, we provide ongoing technical troubleshooting with unparalleled customer service to meet your laboratory's needs. 


We are missioned to provide educational & professional competency resources to promote community well-being & improve laboratory quality.

OUR history

WSLH Proficiency Testing has been building a solid foundation for laboratory improvement since 1966. WSLH PT was developed by the Wisconsin State Laboratory of Hygiene to create proficiency testing programs that improved laboratory quality. Today, our mission has grown to providing proficiency testing services across the United States and around the world. 

Based in Madison, Wisconsin, WSLH Proficiency Testing is the only PT provider that is a part of a national public health laboratory, and is affiliated with the state’s flagship higher education institution, the University of Wisconsin-Madison. 

Some of our features

14 day average turnaround time on evaluation reports

Our staggered shipments ease the burden on staff

Samples are always available at low cost

Easy access to worksheets, submission reports & more

Data Upload: Handle your PT data like your patient data

Get the whirlwind tour

Watch the video to learn more about what you can expect from WSLH PT, including PT Central, customer service and shipping, as well as other services. This video may also be used as a training introduction video for your clinical lab staff. 

To view more training videos, please visit our Video Tutorial Library.

What Our Customers Are Saying

"I placed a small order; however, you treated me with the professionalism and attention as if I had placed a large order."
Justin C.
"Working with WSLH was an excellent experience."
Cathy S.
"I want to compliment WSLH for great customer service!"
Laura M.
"We needed an off-schedule proficiency test; and, from the time I contacted WSLH to getting our results back, the process was so quick. Tracy responded so quickly and made everything effortless."
Christy M.
Great customer service!
Warren B.

How can we best serve your facility? We want to know! Contact WSLH PT Customer Service at (800) 462-5261 or at

WSLH Proficiency Testing is approved by CMS, and accepted by CAP, COLA, and The Joint Commission.