TABLE 2
*For more on the USPSTF's grade definitions, see http://www.uspreventiveservicestaskforce.org/uspstf/grades.htm.
Vision screening for children
Vision screening for preschool children can detect visual acuity problems such as amblyopia and refractive errors. A variety of screening tests are available, including visual acuity, stereoacuity, cover-uncover, Hirschberg light reflex, and auto-refractor tests (automated optical instruments that detect refractive errors). The most benefit is obtained by discovering and correcting amblyopia.
There is no evidence that detecting problems before age 3 years leads to better outcomes than detection between 3 and 5 years of age. Testing is more difficult in younger children and can yield inconclusive or false-positive results more frequently. This led the USPSTF to reaffirm vision testing once for children ages 3 to 5 years, and to state that the evidence is insufficient to make a recommendation for younger children.5
Screening for osteoporosis
The recommendations indicate that all women ages 65 and older should undergo screening, although the optimal frequency of screening is not known. The clinical discussion accompanying the recommendation indicates there is reason to believe that screening men may reduce morbidity and mortality, but that sufficient evidence for or against this is lacking.6
Screening can be done with dual-energy x-ray absorptiometry (DEXA) of the hip and lumbar spine, or quantitative ultrasonography of the calcaneus. DEXA is most commonly used, and is the basis for most treatment recommendations.
The recommendation to screen some women younger than 65 years, based on risk, is somewhat complex. The USPSTF recommends screening younger women if their 10-year risk of fracture is comparable to that of a 65-year-old white woman with no additional risk factors (a risk of 9.3% over 10 years). To calculate that risk, the USPSTF recommends using the FRAX (Fracture Risk Assessment) tool developed by the World Health Organization Collaborating Centre for Metabolic Bone Diseases, Sheffield, United Kingdom, which is available free to clinicians and the public (www.shef.ac.uk/FRAX/).
Screening for testicular cancer
The recommendation against screening for testicular cancer may surprise many physicians, even though it is a reaffirmation of a previous recommendation. Testicular cancer is uncommon (5 cases per 100,000 males per year) and treatment is successful in a large proportion of patients, regardless of the stage at which it is discovered. Patients or their partners discover these tumors in time for a cure and there is no evidence physician exams improve outcomes. Physician discovery of incidental and inconsequential findings such as spermatoceles and varicoceles can lead to unnecessary testing and follow-up.7
Screening for bladder cancer
The USPSTF issued an I statement for bladder cancer screening because there is little evidence regarding the diagnostic accuracy of available tests (urinalysis for microscopic hematuria, urine cytology, or tests for urine biomarkers) in detecting bladder cancer in asymptomatic patients. In addition, there is no evidence regarding the potential benefits of detecting asymptomatic bladder cancer.8
Current draft recommendations
The USPSTF posts recommendations on its Web site for public comment for 30 days. To see current draft recommendations, go to http://www.uspreventiveservicestaskforce.org/tfcomment.htm.