Prevalence of anemia among high‐altitude pregnant women in Shannan, China, and evaluation of altitude‐adjustment methods: A cross‐sectional study

Altitude adjustment increased estimated anemia prevalence by up to four-fold at 3560 m in China. Algorithms derived from non-high-altitude populations may misclassify anemia in these settings. Population-tailored standards that incorporate altitude and trimester are warranted to improve screening accuracy and guide interventions.