What is the significance of reagents' and standards' lot number?

Document ID

Document ID TE3966

Published Date

Published Date 06/28/2018
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Question
What is the significance of reagents' and standards' lot number?
Summary
Interpretation of lot number for reagents' and standards' manufacture date
Answer
Reagents and standards manufactured by Hach are given lot numbers that correspond to the date that they were manufactured. All reagents have a fixed expected shelf life, so with the lot number, a reagent's expiry date can be determined. There are two lot number systems used:
  • Lot numbers beginning with the letter "A" (manufactured by Hach USA)
    • The first number signifies the year. For example, lot A0123B signifies manufacture in 2010 and lot A6005 signifies manufacture in 2016.
    • The last three numbers signifies the Julian date. For example, lot A0123B was manufactured on the 123rd day of 2010 (May 3, 2010) and lot A6005 was manufactured on the 5th day of 2016 (January 5, 2016).
    • If a letter follows the four numbers, this signifies that different batches were manufactured that day. If no letter follows the four numbers, then only one batch was manufactured that day. For example, lot A0123B was the 2nd batch created on May 3, 2010 and lot A6005 was the only batch manufactured on January 5, 2016.
    • This lot number system resets every 10 years (120 months). For example, lot A6005 signifies that a reagent may have been created either on January 5, 2016 or January 5, 2006. No reagent manufactured by Hach has a shelf life that lasts longer than 5 years (60 months), therefore if the reagent is recently purchased, its year number always corresponds with the most recent year of the most recent decade.
  • Lot numbers for TNTplus and LCK/LCS reagent sets (manufactured by Hach UK)
    • The first two numbers signify the year. For example, lot 10123 signifies manufacture in 2010 and lot A16005 signifies manufacture in 2016.
    • The last three numbers signifies the Julian date. For example, Lot 10123 was manufactured on the 123rd day of 2010 (May 3, 2010) and lot 16005 was manufactured on the 5th day of 2016 (January 5, 2016).
    • This lot number system resets every 100 years and will reset next on January 1st, 2100.
The expiry of reagents and standards manufactured by Hach are also found on their Certificates of Analysis (COA).
For COA manufactured by Hach USA visit https://app.hach.com/coaweb/customer_coa_request.asp
For COA manufactured by Hach UK visit https://uk.hach.com/COA


 

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