I'm wondering about something I heard but don't remember about sending off progesterone tests. That there is a certain tube you are or aren't suppose to use because it can cause the numbers to change in transit. Does anyone know what this is. I haven't done any progesterone in awhile and when I asked the vet they use a serum seperator tube to send it off. But I thought?? I recalled that you should use a plain red top tube?
Thanks for any info you can give me.