GIFSQ Tools · Module 14 — LIMS & Quality · Tool 263 of 500
Check a custody handover: the hours between hand-over and receipt, whether the sample stayed cold enough, and whether it arrived inside the 72-hour window.
Try sample values — fills the form with the worked example below.
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Custody time (h)
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Temperature deviation (°C)
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Temperature OK
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Inside 72 h window
Equation: Custody time (h) = days × 24 + receipt hour − hand-over hour. Temperature deviation (°C) = temperature on receipt − maximum allowed; a negative value means the sample stayed below the limit. The sample passes when the temperature is at or below the limit and the custody time is 72 h or less.
Method: Chain-of-custody receipt check per ISO/IEC 17025:2017, clause 7.4 (handling of test items) and ISO 7218 (transport and storage of samples): condition, temperature and time in transit are recorded at receipt before the sample is accepted.
Assumptions: the hand-over and receipt hours are on the same clock; the 72-hour window is the laboratory limit used here — your own procedure may set a shorter one.
Limitations: a pass here does not prove the sample was kept cold the whole way — only the temperature at receipt is measured; a data logger reading covers the journey itself.
Rounding: custody time is a whole number of hours; deviation to 1 decimal place; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value. Records are kept only in this browser on this device (localStorage); this is a device-only record aid, not a shared multi-user LIMS, and nothing is sent to any server.
Method: Chain-of-custody receipt check per ISO/IEC 17025:2017, clause 7.4 (handling of test items) and ISO 7218 (transport and storage of samples): condition, temperature and time in transit are recorded at receipt before the sample is accepted.
Assumptions: the hand-over and receipt hours are on the same clock; the 72-hour window is the laboratory limit used here — your own procedure may set a shorter one.
Limitations: a pass here does not prove the sample was kept cold the whole way — only the temperature at receipt is measured; a data logger reading covers the journey itself.
Rounding: custody time is a whole number of hours; deviation to 1 decimal place; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value. Records are kept only in this browser on this device (localStorage); this is a device-only record aid, not a shared multi-user LIMS, and nothing is sent to any server.
Worked example: Handed over at 09:00, received at 15:00 the same day at 4 °C against an 8 °C limit: custody time 6 h, deviation −4.0 °C — temperature OK and inside the 72-hour window.
Enter values above to see results.
If either check fails, quarantine the sample and raise a deviation — do not log it in as normal. Tool 263 of 500 — GIFSQ
