Dear Irene,

As you may know, the most sensitive and specific ELISA type to measure biomarkers in body fluids is the Sandwich method which in this way, one of the two used antibodies (primary or secondary, depending on the kit design) is monoclonal. Therefore, and considering the probable differences between different species' PL protein structures, no hPL ELISA kit is recommended to measure the sheep samples and vice versa. However, some reliable ELISA kit products are available for human or sheep samples independently as mentioned below:

https://www.mybiosource.com/search/placental+lactogen/reactivity:Sheep;type:ELISA+Kit

Irene Viola Just out of curiosity: What is the scientific question you are addressing? Is oPL a diagnostic marker, e.g. in animal husbandry or farming?

I'd like to detect oPL in my culture medium after trophoblast cells culturing (for my cell characterization)