Hi chip,
Hopefully you are doing more than “5 or 10 minute” test runs and are using the testing guidelines linked in post #1 here.
Latex is more hypoallergenic than other materials because of its ability to ventilate and control temperature and humidity in a mattress. It doesn’t provide a good environment for dust mites which produce the most common allergens in a household.
Latex allergies themselves are very uncommon in mattresses as you can read in post #2 here. In most cases … latex allergies are to the surface proteins that are mostly washed out in natural latex and don’t exist in the first place in synthetic latex.
In most cases … latex is also tested against higher standards such as Oeko-Tex standard 100 class 1 (or other similar testing protocols depending on the type and manufacturer ofthe latex) for harmful ingredients and VOC offgassing than other types of foam materials (such as polyfoam and memory foam). Latex is generally considered to be the “safest” of the foam materials. You can also read more about the different types of latex in post #2 here and post #6 here.
Of course there are also many individual answers to “how safe is safe enough for me” and for those who want to go down the rabbit hole of all the conflicting information that is part of a very controversial subject … then post #2 here and the links and posts it leads to would be a good beginning.
Phoenix