They usually have an expiry date of 1-2 years written on the packet. If the test is expired, the result might be wrong, so it's always best to ask your gynac for a blood test to be safe.
Most urine test strips are good for 12 to 24 months from manufacturing. Just check the backside of the foil wrapper before using it, and if it's expired, throw it away and get a new one.
Hey, always check the expiry date on the box before testing, okay? An expired test can give a false negative and cause unnecessary stress, so buy a fresh one if you are unsure.
Usually, these kits last for a couple of years if stored in a cool place. My mother-in-law says to always use a fresh one from the medical shop, and my doctor also advised the same for accurate results.
When we were trying, I bought a big pack of tests. I felt so emotional when I finally used one after months and it worked, but yes, they do expire after about 1 to 2 years, so always check the box.