Measles IgM Test Change Announcement

UPDATE 05/04/24: A new Measles IgM assay has been validated and testing is once again available at WSLH. We will no longer send specimens to an outside reference lab beginning 05/04/24. There is no change to ordering, reporting, or billing compared to our previous test.


The recent discontinuation of a key reagent in our Measles IgM assay has necessitated a temporary halt in Measles IgM testing at the Wisconsin State Laboratory of Hygiene. We will continue to offer Measles PCR and Measles IgG testing as needed with no change in ordering or time to results. Please refer to the CDC Test recommendation for test guidance.

We are actively addressing this issue and are currently engaged in identifying a new test method that will meet the needs of our patients and providers. During this transition period, specimens submitted to WSLH for Measles IgM testing will be forwarded to another reputable reference laboratory for analysis. This arrangement ensures continued access to accurate testing. This change will not result in additional charges. There will also be no change to the test ordering and results reporting processes.

While every effort will be made to minimize the impact, please be aware that specimens may experience a delay in results as we manage this situation. We anticipate that Measles IgM results will be available within 4-7 days of submission.

Should you have any questions or require further assistance, please do not hesitate to contact our Customer Service department at 1-800-862-1013, available Monday to Friday, 8 am to 4 pm CST.

We sincerely apologize for any inconvenience this temporary slowdown in turnaround time may cause and appreciate your understanding and cooperation as we navigate this transition. Thank you for your continued trust in the WSLH.

Measles IgM Test Change Announcement memo