ovulation test

How long can you keep ovulation test I have Answers Ovulation test strips it say  throw out after 30 days I have only used 1 and I am deciding to wait to next cycle to use more so my progestrone is up bc I am not producing it at this time can I do that or I have to throw the 19 strips away

[ConnieG]

I think it depends on what kind.  I have the individually wrapped ones that I think I can keep for a long time without a problem.  But then last time I bought 20 in one bottle and it said once I open the bottle that I shouldn't use any after 30 days.  I was able to use them for 2 cycles because it was only 28 days between.  

[TinaR10]

bump

[ConnieG]

I think it depends on what kind.  I have the individually wrapped ones that I think I can keep for a long time without a problem.  But then last time I bought 20 in one bottle and it said once I open the bottle that I shouldn't use any after 30 days.  I was able to use them for 2 cycles because it was only 28 days between.  

[msniki412]

I always thought those test have experation dates? I remembered a while back, I ordered some cheapies on the internet and they all gave me an exp date of 1 year.