Lucas speaks of 50 venesections being practiced during one pregnancy.

Van der Wiel performed venesection 49 times during a single pregnancy.

Balmes mentions a case in which 500 venesections were performed in twenty-five years.

Laugier mentions 300 venesections in twenty-six months.
Osiander speaks of 8000 ounces of blood being taken away in thirty-five years.

Pechlin reports 155 venesections in one person in sixteen years, and there is a record of 1020 repeated venesections.
The loss of blood through spontaneous hemorrhage is sometimes remarkable.