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Hi Cindy, Thanks for raising this issue. I don’t think our team would be open to pursuing a 25mL split lot as this is below our minimum manufacturing size. I don’t recall seeing a history of instability with this analyte. Perhaps it’s best to have our technical support team investigate this and advise. Can you please fill in the below table with the information and our team can look into this? If you have specific data points from the customer that will be very helpful. Thank you, Field Required Customer Entry Customer Identification Number (CID) Contact Name Contact Email Sales Order # (or) Lot# (or) Part# *Two of the three are required What happened? (e.g., Part number 1234 was shipped) What should have happened? (e.g., part number XYZ should have been shipped) Additional Comments (e.g., steps already taken to troubleshoot, additional notes, or preferred resolutions) 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: Cindy SERRAIN <c.serrain@eurobio-scientific.com> Sent: Thursday, October 2, 2025 2:27 AM To: Andrew Hartmann <ahartmann@utak.com> Subject: ETHGLY100PF and ETHGLY200PF. BREST Hello Andrew, We are placing an order for the following references: ETHGLY100PF and ETHGLY200PF. Our customer has observed a significant decrease in the control values after 6 months and has decided to stop ordering if this issue persists. To address this problem, would it be possible to receive two separate lots: the first one of 25 ml now, and a second lot of 25 ml six months later? She also mentioned that she feels the matrix has changed. Do you have any information about this? Kind regards