Walk-In Lab’s Estrone Serum test is ordered to measure or monitor estrogen levels in both males and females.This blood test is also known as E1 and does not require fasting in preparation. Results are delivered within two to three days of taking the test. An estrone serum test is a cost-effective, confidential and convenient alternative for those without a doctor’s order or health insurance.Women order the estrone serum test to measure and monitor estrogen levels and help explain abnormal menstrual cycles, infertility symptoms of menopause, abnormal or heavy bleeding, infertility, or any other hormonal alterations. This blood test is also used to check for fetal-placental status during early stages of pregnancy and to evaluate feminization (the presence of female-like characteristics in males). An E1 blood test can help evaluate postmenopausal vaginal bleeding due to peripheral conversion of androgenic steroids. Additionally, increased estrone levels may be associated with increased levels of circulating androgens and their subsequent peripheral conversion.