BMP6 and anemia: On the other hand, when analyzing the differences in BMP-6 concentration in the studied groups of patients, significantly higher BMP-6 levels were found in patients with CD with concomitant anemia compared to the control group (0.432 ± 0.158 ng/mL vs. 0.359 ± 0.072 ng/mL, p = 0.021).