Please note there will now be an official plasma specimen threshold for Cobalt, to complement the existing urine threshold.

This plasma threshold is an equivalent threshold to the urine threshold.

The NHA website current guidance for the use of (and withdrawal of) Cobalt products and Vitamin B12 in the horse therefore remains unchanged.     

Cobalt ……. 0.1 microgram total cobalt per millilitre in urine (EXISTING) …… 0.025 microgram total cobalt (free and protein bound) per millilitre in plasma (NEW)