... Step hCG Pregnancy detects hCG at a concentration of 25mlU/mL or greater. 300 know negative urine samples were equally divided ... to the concentration of 0mlU/ml, 10 mlU/ml, 15 mlU/ml, 25 mlU/ml, 50 mlU/ml and 5 IU/ml separately, calibration against WHO ... drugs and hormones including LH(500mlU/ml),FSH(1,000mlU/ml),and TSH(1,000μlU/mL).At the levels tested, none of ...