Early pregnancy detection test using urine. Effective results in just a few minutes. Description Early pregnancy detection test using immunochromatographic determination of HCG levels in urine. It has a 99% accuracy rate for both positive and negative results, which is why we always recommend, regardless of which pregnancy test you choose, that you always purchase two units to ensure a definitive positive or negative result. A positive result may be seen after 1 minute. However, a negative result requires 5 minutes to complete the reaction, so do not read the result after 10 minutes.