GIFSQ Tools · Module 14 — LIMS & Quality · Tool 276 of 500
Record a media batch: powder weighed from the label rate, plates poured from the batch volume, and the expiry day from the shelf life.
Try sample values — fills the form with the worked example below.
Saved on this device only.
| Date | Powder (g) | Plates | Expiry day |
|---|---|---|---|
| No saved results yet. | |||
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Powder to weigh (g)
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Plates poured
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Batch volume (mL)
–
Expiry day
Equation: Powder (g) = batch volume (L) × powder per litre (g/L). Plates = batch volume (mL) ÷ volume per plate, rounded down to whole plates. Expiry day = prepared day + shelf life in days.
Method: Media preparation per ISO 11133:2014 (preparation, production, storage and performance testing of culture media): the powder is weighed from the label rate for the batch volume, and the batch is dated with its preparation day and shelf life.
Assumptions: the powder is fully dissolved and the volume is the final made-up volume; a little volume is always lost to pouring, so the plate count is a maximum.
Limitations: the register records the batch — it does not check the pH or the growth-promotion test, which the method requires before the batch is released.
Rounding: powder to 2 decimal places; plates and expiry day are whole numbers; 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: Media preparation per ISO 11133:2014 (preparation, production, storage and performance testing of culture media): the powder is weighed from the label rate for the batch volume, and the batch is dated with its preparation day and shelf life.
Assumptions: the powder is fully dissolved and the volume is the final made-up volume; a little volume is always lost to pouring, so the plate count is a maximum.
Limitations: the register records the batch — it does not check the pH or the growth-promotion test, which the method requires before the batch is released.
Rounding: powder to 2 decimal places; plates and expiry day are whole numbers; 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: A 2 L batch at 37 g/L, 20 mL per plate, prepared day 100 with a 30-day shelf life: 74.00 g of powder, 100 plates, expiry day 130.
Enter values above to see results.
Saved on this device only — entries stay in this browser and are never sent anywhere. Use the Clear button to remove them. Tool 276 of 500 — GIFSQ
