A faecal egg count reduction test is designed to check for resistance after a worming treatment has been given for redworm and roundworm. 
 
It is recommended to perform this test 10-14 days after treatment has been recommended following a positive faecal egg count or winter worming treatment for encysted small redworm. 
 
When submitting your sample,  the end of the wormer box used with the batch code must be included