Final answer:
Ovulation testing measures the level of LH (luteinizing hormone) in the bloodstream, not hCG.
Step-by-step explanation:
Ovulation testing measures the level of LH (luteinizing hormone) in the bloodstream, not hCG (human chorionic gonadotropin). LH is released by the pituitary gland in response to rising levels of estrogen and triggers ovulation. Ovulation tests detect the surge in LH, which helps predict when ovulation is about to occur.