GuidesFor CRCs on multi-arm studies
Tracking Kit Inventory Across Multi-Arm and Multi-Cohort Studies
Apr 22, 2026GuideCohort Kit TrackerAdministrative reference · Zero-PHI examples only
cohortmulti-armFIFOkit inventoryZero-PHI
Why a flat kit list breaks on multi-arm protocols, what CRAs actually inspect at the cohort level, and how Cohort Kit Tracker keeps FIFO inventory by study, arm, and visit type.
The problem on the clinic floor
A single flat kit list falls apart the moment a protocol has more than one arm or cohort. The operational question stops being “what expires first in the closet?” and becomes “which arm is about to run short of the right visit-type kits?” Force that into one spreadsheet tab and you get duplicate rows, merged cells, and someone double-counting a lot that was already allocated to Arm B.
Coordinators feel this on clinic mornings: the kit pull sheet says Cohort 2 / Cycle 1, but the inventory sheet only says “EDTA kits — 18 left.” You either over-pull from the wrong shelf or under-pull and scramble mid-visit. Monitors feel it too — they ask for inventory by cohort and visit type, not a single site total.
Quarantine and disposition add another axis. Expired or seal-compromised stock for one arm should not sit in the same “available” count as FIFO-ready stock for another. Without status and cohort labels together, the closet looks fine until someone pulls a quarantined box by habit.
Protocol amendments make flat lists worse. When a new arm opens or visit-type requirements change, someone adds rows at the bottom of a shared sheet while the physical closet gets a new shelf label. Two weeks later nobody remembers which lots were earmarked for which arm, and FIFO discipline breaks down into “we think this box is for Cohort 1.”
Cross-study clutter is common on busy sites. The same closet holds kits for three protocols; a flat export from one tracker does not tell the CRA which lots belong to which study structure. Monitors expect batch-level clarity that matches the protocol diagram, not a site-wide pile sorted only by expiration.
Practice context
CRA review of IP/supply accountability on multi-arm oncology and similar designs usually expects batch-level clarity: protocol, cohort/arm, kit type, lot, quantity, expiration, and disposition status. Accession-level detail for every unit is often more granularity than the site can keep current — and more than the monitor needs for a weekly closet check.
FIFO still applies inside each arm’s usable stock: earliest expiration first among kits that are actually available to dispense. Quarantined or destroyed lots should be visible separately so they do not inflate “ready” counts. None of that requires subject allocation lists in the inventory tool.
Sponsor supply teams often ship cohort-specific kits with labels that already imply arm assignment. The site’s job is to mirror that structure in inventory so pulls, destruction, and reorder requests reference the same cohort language the protocol and IWRS use.
When monitoring asks for destruction evidence, they typically want it tied to the same cohort and kit-type buckets as the active inventory — not a separate ad hoc list compiled after the fact. Keeping quarantine reasons visible (expired, damaged seal, temp excursion) shortens those conversations.
How to use Cohort Kit Tracker for this
Treat Cohort Kit Tracker as the shelf map CRAs already expect to see — by study structure, not as a second flat lot dump. Set up rows the way the protocol organizes arms and visit types so a morning pull decision and an afternoon monitoring question read from the same board.
- Open Cohort Kit Tracker and enter inventory with protocol, cohort/arm labels, kit types, lot/accession codes, quantities, and expirations. Skip subject names and subject IDs — use the same arm and visit-type language as the protocol and kit labels.
- Use FIFO dispensing from earliest-expiration usable stock within the relevant cohort/visit context. Do not pull from expired rows — they surface as Expired and stay out of FIFO. When two lots qualify, the tool should reflect which one expires first for that arm.
- When stock is compromised or past expiration, mark Quarantined with a reason (Expired, Damaged Seal, Temp Excursion, Protocol Hold, etc.) so CRA filters can list isolated inventory separately. Quarantined rows should never inflate the “available” count for that cohort.
- Export CRA destruction / audit CSV when monitoring needs disposition proof. Use Export Session Backup (.json) before switching clinic workstations so cohort labels and quarantine status move intact.
- Keep Kit Expiration Tracker for single-kit / lot-centric closets; use Cohort Kit Tracker when arms and visit types are the organizing principle. Running both on the same protocol is fine — pick the board that matches how monitors ask the question.
Multi-arm inventory fails when the data model is flatter than the protocol. Match the board to the arms, and FIFO becomes a pull decision instead of a reconstruction. When cohort labels on the shelf match cohort labels on the screen, monitoring stops feeling like a translation exercise.