Endometrial sampling and obesity: Forget the "age 45" rule
Wise MR, Gill P, Lensen S, Thompson JM, Farquhar CM. Body mass index trumps age in decision for endometrial biopsy: cohort study of symptomatic premenopausal women. Am J Obstet Gynecol. 2016;215(5):598.e1-e8.
How do we bring more value to our patients with AUB? We are well aware that heavy menstrual bleeding places a burden on many women; AUB affects 30% of those of reproductive age. The condition often results in lost workdays and diminished quality of life. It also is associated with significant cost expenditures for hygiene products. It is important not only to bring value to women with heavy menstrual bleeding but also to consider our increasingly expensive health care system.
Obesity is a significant problem that likely will increase the number of women presenting with AUB to ObGyns. Recent studies from New Zealand--which has 33% of its population classified as obese--have provided valuable information.1
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Endometrial cancer sample seen on low-power microscopy.
Obesity is a risk factor for endometrial hyperplasia
In a large retrospective cohort study, Wise and colleagues analyzed data from 916 premenopausal women referred for AUB who had an endometrial biopsy from 2008 to 2014. The setting was a single large urban secondary women's health service in New Zealand. This study challenges the concept of age-related biopsy guidelines.
Of the 916 women, half were obese. Almost 5% of the women had complex endometrial hyperplasia with atypia or cancer. This incidence had risen from 3% in the years 1995 to 1997, likely due to the rising incidence of obesity. Women with a BMI ≥30 kg/m2 were 4 times more likely to develop complex hyperplasia or cancer than normal-weight women.
Other factors associated with an increased risk for complex hyperplasia or cancer were nulliparity (odds ratio [OR], 2.51; 95% confidence interval [CI], 1.25-5.05), anemia (OR, 2.38; 95% CI, 1.25-4.56), and a thickened endometrium on ultrasonography (defined as >12 mm; OR, 4.04; 95% CI, 1.69-9.65). Age was not a significant risk factor in this group.
WHAT THIS EVIDENCE MEANS FOR PRACTICEAlthough guidelines suggest that age 45, or age 40 with obesity, should be used as an indication for endometrial sampling in women with AUB, results from this study suggest that obesity (BMI ≥30 kg/m2) should be considered a more important risk factor than age. We will adjust our practice according to these findings, as the risk is fairly significant.