Storage Conditions Are a Protocol Requirement

Part of Clinical Laboratory (LAB) Training: Storage, Freezers and Excursions.

About 2 minutes. Free, in your language, no account needed.

The temperature is part of the specification

Minus twenty, minus eighty, liquid nitrogen vapor phase, or two to eight degrees. Each is chosen for the analyte and each is a requirement, not a preference.

Storing colder than specified is not automatically safer. Some samples are damaged by freezing, and freeze-thaw cycles degrade many analytes.

Know where every sample is

Freezer, shelf, rack, box, position. Recorded at the time it goes in.

A study sample without a recorded position is findable only by opening boxes, which warms every other sample in the freezer while you search.

Monitoring must be continuous and recorded

A thermometer somebody reads each morning tells you nothing about the night.

Continuous logging, with alarms, is the standard. The log is the evidence that conditions held, and it is reviewed during monitoring visits.

Alarms need someone to answer them

An alarm that sounds in an empty building on a Friday night has done its job and achieved nothing.

There must be a documented out-of-hours route, with names, numbers and a backup. Test it periodically and record the test.

The most expensive freezer failures are the ones where the alarm worked correctly.

Minimize door time

Every opening warms the contents. Plan what you need before you open, and take it out in one movement.

Pulling a box to find a sample, at the bench, with the freezer closed, is better than searching with the door open.

Backup capacity is part of the plan

If a freezer fails, where do the samples go? Is there space? Is there a cart? Who is called?

A plan written after the failure is not a plan. Knowing the answer in advance turns a crisis into a transfer.

Separate study samples from routine work

Mixed storage is how study samples get used, discarded or misplaced by people who did not know what they were.

Clear segregation and clear labeling protect the samples from ordinary laboratory activity.