A one-step test for HCG in urine or serum, just add 3 drops of urine or serum and read, positives turn color as early as 3 minutes in urine and 5 minutes in serum, >99% accuracy, 10 mlU/mL sensitivity, serum; 20 mlU/mL sensitivity, urine. Results 2 to 3 days before expected menses.