About WSLH Proficiency Testing

The WSLH in WSLH Proficiency Testing stands for the Wisconsin State Lab of Hygiene, the national public health lab where we provide clinical laboratories like yours reliable, affordable, and easy-to-use proficiency testing products with rapid access to results. Contact us today to get started: ptservice@slh.wisc.edu | (800) 462-5261

Why choose WSLH PT? Download this one-page handout to share with your lab.


Get the whirlwind tour. View our video to learn more about our customer service, shipping, online data entry portal, as well as other services. This video may also be used as a training introduction video for staff. To view our training videos, please visit our Video Tutorial Library.




Your Lab. Our Mission.

As the only PT provider from a public health lab, your lab is our mission. It has been since 1966. Based in Madison, Wisconsin, WSLH Proficiency Testing serves clinical laboratories in all 50 states and around the world.

We provide proficiency testing for a wide range of analytes, and our products are competitively priced. Laboratories can receive additional service year-round through off-schedule ordering, linearity and calibration verification products, and remedial testing.


What customers are saying

“I placed a small order; however you treated me with the professionalism and the attention as if I had placed a large order.” -Jason C.

“Working with WSLH was an excellent experience.” -Cathy S.

“I want to compliment WSLH for great customer service!” -Laura M.

“I would love to share the positive experience we just had from WSLH. We needed an off schedule proficiency and from the time I contacted WSLH to getting our results back was so quick. Tracy responded so quickly and made everything effortless.” -Christy M.

“Great customer service!” -Warren B.


Some of our features


14 day average turnaround time on evaluation reports


Our staggered shipments ease the burden on lab staff



Replacement samples, off schedule samples, and evaluation samples are always available at low cost.


Easy access to worksheets, instructions, submission reports, and more


New PT Data Upload: Save time, reduce data entry, handle your PT data like your patient data



WSLH Proficiency Testing is approved by CMS, and accepted by CAP, COLA, and The Joint Commission.
Questions? Contact us at ptservice@slh.wisc.edu.



Contact WSLH Proficiency Testing | (800) 462-5261 | ptservice@slh.wisc.edu