Is the early pregnancy test paper still accurate after it expires

Early pregnancy test strips are often inaccurate when they expire.

Chemicals in early pregnancy test strips may change over time, causing sensitivity and specificity to decrease, affecting the accuracy of test results. After expiration, these chemicals may no longer react accurately with relevant components in urine, increasing the probability of false negative or false positive results. Expired test strips may not accurately identify subtle changes in specific hormone levels in urine after pregnancy, making test results unreliable. It may fail to detect the presence of hormones early in pregnancy, or give the wrong diagnosis.