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Hi Kevin, I’m happy to look into drug spiked options for these. To help our team look into it, lets get the idea design info from you. From there our team will review and then likely look to have a call with our product design engineer to discuss feasibility. For the Hair matrix: 1. What is your ideal fill size per vial 2. Ballpark estimate of how many vials you will use in a year. 3. List of your target analytes and desired concentrations. For the Meconium matrix: 1. What is your ideal fill size per vial 2. Ballpark estimate of how many vials you will use in a year. 3. List of your target analytes and desired concentrations. We don’t have PT options for these matrices. We do have them for blood/urine/serum. What we can offer is blind samples where you provide your clinical range and target analytes. We choose concentrations and break them up into a few products. These are sent blind and after you test them we send you the IFU with the target values for comparison. Thank you, Andrew Hartmann Business Development Manager – 25020 Avenue Tibbitts Valencia, CA 91355 – D +1.661.567.0667 P +1.888.UTAK.LAB F +1.661.294.9272 – Book a Meeting with Me https://calendly.com/ahartmann-utak/30min utak.com From: Kevin Howington <khowington@expertox.com> Sent: Wednesday, October 22, 2025 10:41 AM To: Andrew Hartmann <ahartmann@utak.com>; Crystal Evans <cevans@expertox.com> Subject: Re: Hello from UTAK: I’m Your New Account Manager It was good talking with you yesterday, thanks for sending the CoA. I have a couple more questions for you. 1. Do you offer positive controls that are in hair or meconium matrix? If so, can specific analytes with specific levels be requested? 2. I forgot to ask yesterday, but do you have a proficiency testing program, specifically for hair or meconium? Best regards,