In-Vivo Animal Core Winter 2021 Holiday Hours

December 23, 2021 12:00 PM to January 3, 2022 8:00 AM

Snow covered pine treesSeveral service areas in the Unit for Laboratory Animal Medicine (ULAM) will be closed or operating at limited capacity during the upcoming holiday season.

Both In-Vivo Animal Core (IVAC) locations at NCRC and ARF will be closed beginning at 12:00 PM (noon) on Thursday, December 23 – Friday, December 31, 2021. The deadline for sample submissions needing results (CBC) or partial results (paraffin histology processing/embedding) BEFORE the holidays is Monday, December 20 at 3:00 PM (ARF) and 4:00 PM (NCRC).

This deadline was chosen to allow IVAC staff sufficient time before the holiday break to process samples to a stable stage. CBCs must be completed within 24 hours of receipt, and paraffin histology samples are stable once they reach the embedding stage.

Samples that do not need processing prior to the holidays (frozen serum, glass slides, paraffin blocks) can be submitted by appointment up until the closing date; no work will be done during the time periods that IVAC is closed.

As a reminder, sample submission is by appointment only. Study teams are strongly encouraged to book their appointments early, particularly if they anticipate a large submission, in order to help IVAC staff plan their workflows accordingly.

IVAC locations will re-open on Monday, January 3, 2022, at 8:00 AM (NCRC) and 9:00 AM (ARF). 


  • Questions about IVAC services should be directed to
  • If you have questions about ULAM holiday hours, please contact the ULAM Business Office at or (734) 764-0277 (leave a voicemail and your call will be returned).