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DPO = Days Past Ovulation, this is the reason why tests done before af arrives may show negative results. * At 14 DPO, the average HCG level is 48 mIU/ml, with a typical range of 17-119 mIU/ml. * At 15 DPO, the average HCG level is 59 mIU/ml, with a typical range of 17-147 mIU/ml. * At 16 DPO, the average HCG level is 95 mIU/ml, with a typical range of 33-223 mIU/ml. * At 17 DPO, the average HCG level is 132 mIU/ml, with a typical range of 17-429 mIU/ml. * At 18 DPO, the average HCG level is 292 mIU/ml, with a typical range of 70-758 mIU/ml. * At 19 DPO, the average HCG level is 303 mIU/ml, with a typical range of 111-514 mIU/ml. * At 20 DPO, the average HCG level is 522 mIU/ml, with a typical range of 135-1690 mIU/ml. * At 21 DPO, the average HCG level is 1061 mIU/ml, with a typical range of 324-4130 mIU/ml. * At 22 DPO, the average HCG level is 1287 mIU/ml, with a typical range of 185-3279 mIU/ml. * At 23 DPO, the average HCG level is 2034 mIU/ml, with a typical range of 506-4660 mIU/ml. * At 24 DPO, the average HCG level is 2637 mIU/ml, with a typical range of 540-10,000 mIU/ml