Biobank: Tiers, Samples & Traceability
A biobank is not “buy a few freezers”. Tier by sample type, then add inventory coding, chain-of-custody records and temperature traceability so every sample is findable, usable and auditable.
A biobank is not “buy a few freezers”. Tier by sample type, then add inventory coding, chain-of-custody records and temperature traceability so every sample is findable, usable and auditable.
Temperature tiers: split by sample type
Different samples have different stable temperatures; mixing them wastes equipment and adds risk. A common tiering:
| Zone | Typical samples |
|---|---|
| 2–8°C | Reagents, enzymes, some blood components |
| -25 to -40°C | Plasma, some biological products |
| -86°C | DNA/RNA, microbial strains, tissue, serum |
| -150°C / vapour LN2 | Cell lines and precious long-term samples |
Inventory and sample management
- Code racks and boxes consistently, locating to “box-layer-position”
- Register each sample on intake: source, collection time, processing
- Two-person check for critical operations to cut entry errors
- Regular audit and track the sample lifecycle (collect → store → retrieve → discard)
Chain of custody and traceability
Every sample should carry a record from collection, transfer and storage to retrieval. Temperature logging and alarms are part of that chain: when something goes wrong, you can pinpoint the affected time window and sample set, and decide on re-test or recall.
Alarms and redundancy
- Four alarm types: over-temperature, power failure, sensor fault, door-open timeout
- UPS and standby units to limit single-point failure
- Remote monitoring interface for immediate push on break
Common mistakes
- Buying only by capacity, without temperature tiers
- Storing samples but never recording them
- Alarms not connected, logs not exported — traceability becomes empty talk
- No backup, so one failure stops everything
Frequently asked questions
Can I just store everything at -80°C?
No. Reagents and plasma do not need -80°C; over-deep-freezing wastes energy and is often unnecessary. Tier by the sample's stable temperature — that is the rational approach.
Does a biobank need a software system?
Small scale can run on coding plus spreadsheets. At larger scale, or where clinical/research responsibility is involved, informatised inventory and temperature traceability substantially reduce errors and compliance risk.
Liquid nitrogen or -150°C deep-freeze?
Both serve long-term deep storage. Vapour-phase LN2 suits large cell-line banks but needs LN2 supply and safety management; -150°C units remove the LN2 dependency and suit labs that prefer not to manage it. See -80°C freezer vs liquid nitrogen.
Related reading: long-term deep-freeze units on the -150°C deep-freeze page; routine ultra-low selection in how to choose an ultra-low freezer; vaccine context in vaccine cold chain.