When two sources give different concentrations for one vial

When two sources give different concentrations for one vial

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You have a number written on the vial and a different number in your record, or a figure from a leaflet that does not match your calculation. Two sources, one vial, and they disagree. There is only one safe way to proceed.

Do not average, do not pick the more familiar one, and do not use the vial. Go back to the physical inputs and rebuild the concentration from scratch: what the label says is in the vial, and how much diluent you recorded adding. That derivation is the authority, and the two disagreeing numbers are both just claims until it is done.

If the derivation matches one of them, you have found which is wrong and can correct it, noting the correction. If it matches neither, something more fundamental is off and that is a question for a pharmacist rather than a puzzle to solve alone.

The most common cause is a label written for a previous vial, which is why the discipline of writing the marker label at the moment of mixing, and binning the old card at the same moment, matters so much. The second most common is a transcription error into the record.

Once resolved, write the resolution down. A Peptide Tracker & Calculator that stores the vial quantity and diluent volume as the record, with concentration derived, means this class of disagreement cannot arise from the record's side, because there is only one place the number comes from.

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