Insulin Storage MKT Calculator

Unopened insulin is stored at 2–8 °C; once in use, most insulins may be kept at room temperature (often up to 25–30 °C) for a labelled number of days (commonly 28). The authoritative limit is whatever your product's labelled storage condition and stability data specify — read it off the marketing authorisation, the manufacturer's storage statement or the governing pharmacopoeia, and enter your real temperature history against it.

It depends which stock and the product's own rules. Unopened insulin should stay at 2–8 °C; a brief warm excursion may be tolerable if the MKT stays in range, but follow the manufacturer's guidance and never use insulin that has frozen (freezing destroys it). In-use pens/vials are different — most insulins are designed to be kept at room temperature (up to ~25–30 °C depending on product) for a set number of days once started. This calculator addresses the refrigerated-storage heat history; for medical decisions about a specific person's insulin, follow the patient information leaflet and a pharmacist or clinician.

Because degradation is not linear with temperature — it accelerates roughly exponentially (Arrhenius). A simple average treats an hour at 30 °C the same as an hour at 20 °C either side of 25 °C, but the product is harmed far more by the hot hour. MKT weights each reading by exp(−ΔH/RT), so it reflects the true cumulative chemical stress. It is always ≥ the arithmetic mean, and it is the figure regulators expect for storage and distribution compliance.

Use a representative series with durations — typically the logger's interval readings, or summarised blocks of 'X hours at Y °C' if you only have an excursion summary. The more granular the data, the more accurate the MKT, but the result is dominated by the warm excursions, so capturing those accurately matters most. Don't average data before entering it — that defeats the point; enter the temperatures and let the calculator do the kinetic weighting.