Are these blood collection tubes ok?

[mrstillery09]

First time doing blood draws! Getting supplies together and ready. Found these red top blood collection tubes on amazon. Nice price and I have a free trial of prime and can get them shipped for free in two days! Just wanted to make sure these were ok to use before I bought them.

http://www.amazon.com/Vacuette-Evacu...tion+tubes+red

[mygoat]

Should be fine, it says there is no additive.

[mrstillery09]

Thank you!! I thought they were ok, but I am so scared I'm going to do something wrong!