Why is the erythrocyte sedimentation rate for a menstuating female slightly elevated?

During menstruation, there is an increase in the levels of estrogen and progesterone in the body. These hormones cause the blood vessels to dilate and the blood to flow more slowly. This can lead to a slight increase in the erythrocyte sedimentation rate (ESR).

The ESR is a measure of how quickly red blood cells settle to the bottom of a test tube. When the ESR is high, it means that the red blood cells are settling more quickly, which can be a sign of inflammation or disease. However, a slightly elevated ESR during menstruation is normal and does not indicate a health problem.