TED-Ed: How do pregnancy tests work? - Tien Nguyen

The video explores the evolution of pregnancy tests from ancient Egyptian methods to modern over-the-counter tests. Ancient tests involved urinating on seeds, while modern tests detect the hormone HCG. The video explains how these tests work, including the role of antibodies and enzymes in creating visible results. It also discusses the reliability and limitations of these tests, such as false negatives and positives, and emphasizes the importance of medical confirmation for accurate results. The scientific method is highlighted as a key component of modern testing.

Explain the process that occurs when urine is applied to a pregnancy test strip.

What are some factors that can lead to false positives in pregnancy tests?