Exploring Reasons for Loss to Follow-up in Pregnancy of Unknown Location: A Mixed-Methods Study.

To quantify proportions of loss to follow-up in patients presenting with a pregnancy of unknown location and explore patients' perspectives on follow-up for pregnancy of unknown location. A pregnancy of unknown location is a scenario in which a patient has a positive pregnancy test but the pregnancy is not visualized on transvaginal ultrasound. We conducted a retrospective cohort study of patients with pregnancy of unknown location who presented to an urban academic emergency department or complex family planning outpatient office.

Fetomaternal hemorrhage assessment in Rh-negative patients undergoing dilation and evacuation between 20 and 24 weeks' gestational age: A retrospective cohort study.

Objective: To estimate the rate of requiring more than one 300-mcg Rh D immune globulin dose for fetomaternal hemorrhage (FMH) at the time of second-trimester dilation and evacuation (D + E).

Study Design: We performed a retrospective cohort analysis of patients at greater than 20 weeks' gestation who underwent D + E, had Rh D-negative blood type, and received FMH quantification testing.

Results: Of 25 eligible patients, 24 had negative quantification of FMH; one had positive quantification that did not meet the clinical threshold for additional dosing.

Feasibility and acceptability of monitoring personal air pollution exposure with sensors for asthma self-management.

Background: Exposure to fine particulate matter (PM) increases the risk of asthma exacerbations, and thus, monitoring personal exposure to PM may aid in disease self-management. Low-cost, portable air pollution sensors offer a convenient way to measure personal pollution exposure directly and may improve personalized monitoring compared with traditional methods that rely on stationary monitoring stations. We aimed to understand whether adults with asthma would be willing to use personal sensors to monitor their exposure to air pollution and to assess the feasibility of using sensors to measure real-time PM exposure.

Vision Testing Among Children Aged 3-5 Years in the United States, 2016-2017.

Childhood vision screenings may provide early detection of vision disorders and opportunities for subsequent treatment (1). The United States Preventive Service Task Force recommends that children aged 3-5 years receive a vision screening at least once to detect amblyopia (lazy eye), or its risk factors (2). This report examines the percentage of children aged 3-5 years who have ever had a vision test by selected characteristics using data from the vision supplement included in the 2016-2017 National Health Interview Survey (NHIS).