The Natalist midstream ovulation test is a qualitative test with a sensitivity level of 25mIU/mL. In a 2014 study of 40 volunteers, there were LH levels recorded that broadly ranged from 6.5 mIU/mL to 101 mIU/mL, with a median of 44.6 mIU/mL. A common threshold to detect LH is 25-30 mIU/mL which accommodates tracking from a baseline level (<10 - 20mIU/mL) to an identified peak or surge (>20-40+ mIU/mL).