Lot number
In short The identifier of a production batch, printed on the vial label.
All vials filled from the same production run share one lot number, also called a batch number. It is the link between the vial on your bench and the paperwork behind it: the certificate of analysis, the date of manufacture and any later correspondence about that batch.
On UKPeps vials the lot number is printed on the label. Enter it in the certificate library and the matching row shows the laboratory, the date of analysis and the measured purity, with the PDF. If no row matches, write to us with a photo of the label and we will trace it.
Some lot numbers begin with PO-. The prefix is part of the number as the manufacturer issued it, so enter it exactly as printed. Two certificates can carry the same lot number when a lot was tested twice, for example once by each laboratory or once before and once after a change of excipient; the library shows both.
Keep a note of the lot number in your laboratory records. If a result needs to be reproduced later, the lot is the first thing anyone will ask about.