| Front | How does a pregnancy test work. |
|---|---|
| Back | Placenta produces a hormone called human chorionic gonadotrophin (hCG) 1. The mobile antibodies attach to the hCG, the mobile antibodies have a blue dye attached (reaction zone) 2. Immobilised antibodies specific to hCG and if hCG present blue line would form (results window) 3. Immobilized antibodies specific to mobile antibodies so if hCG not present a line would still form in control window if no line formed in control window the test is defective. |
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