How should temperature loggers be managed for vaccines and other cold chain products?

• A. Calibrate; place in representative locations; monitor continuously; review logs; act on excursions; document actions taken.
• B. Ignore calibration; place randomly; never monitor.
• C. Only check once a year; do not document.
• D. Use them only for vaccines; other products not necessary.

Answer: (A)

Maintaining an accurate, traceable record of cold-chain temperatures is essential for vaccine integrity. Temperature loggers must be calibrated so their readings reflect the true environment; without calibration, data can be incorrect and lead to unsafe or wasted vaccines. They should be placed in representative locations within the storage unit to capture the typical conditions the vaccines experience, not just in spots that happen to remain stable or near a door. Continuous monitoring (or at least frequent monitoring with alarms) allows immediate detection of excursions, enabling prompt intervention before potency is compromised. The logs should be reviewed regularly to identify patterns, verify compliance, and provide an audit trail. When excursions occur, appropriate actions must be taken—adjust the temperature, quarantine affected lots, and notify QA or responsible staff—and every action should be documented to show how the issue was handled and resolved. These elements work together to ensure the cold chain remains intact and vaccines stay safe and effective. The other approaches miss essential safeguards—no calibration, random placement, no monitoring, infrequent checks, or lack of documentation—risk undetected temperature problems and poor traceability.