Paraquat urine detection test kit


Semi-quantitative confirmation paraquat poisoning.

Paraquat detection kit


Available free from Syngenta Australia. Contact Syngenta by email or phone to obtain a supply kit:


t: (02) 8876 8444

Instructions for use

  • Obtain a urine sample ideally 4-6hours following suspected paraquat exposure.
  • Put 10mL of urine into a clear container, add 2g sodium bicarbonate (Sachet A) and shake gently. Add 1g sodium dithionite (Sachet B). Allow effervescence to subside, then shake again. Once mixture settled, view against a white background.
  • A blue or greenish grey colour shows paraquat is present (as per below).

Paraquat detection kit colour guide


Paraquat test kits are strongly advised to be stocked in all facilities. Unintentional paraquat exposures are common – but significant exposures are rare. Lower risk exposures with a negative urinary dithionite test do not need further treatment. Having this test available can prevent unnecessary transfer.


Fact sheet developed by Queensland Poisons Information Centre.

This fact sheet is about the use of these antidotes in Australia, and may not apply to other countries. Children’s Health Queensland Hospital and Health Service cannot be held responsible for the accuracy of information, omissions of information, or any actions that may be taken as a consequence of reading this fact sheet.

Last updated: July 2023