Answer:
The twins were examined from head to toe. Measurements of every inch were taken. Dr. Mengele demanded specific and careful exams. If any detail was missed the staff, usually a prisoner doctor, would be punished. The twins were allowed to keep their hair for the first several days of the examination. After all the living data was taken the twins would be killed by a single injection of chloroform in the heart. Care was taken to insure the twins died at the same time. The twins were then dissected with the organs being sent to research centers.
Prisoner doctors tell of the fate of two Hungarian twins who arrived at Auschwitz late in 1943. Dr. Mengele was at the camp selection. The train arrived in the very early morning. Three sets of twins were found. They were taken to the experimental block. Dr. Mengele ordered the two Hungarian twins be placed in the examination room. The two Hungarian twins young men age 18 were described as "extremely athletic and handsome." They had much body hair and were allowed to keep it for the first few weeks. The twins were showered and returned nude to the examination room. The examination started at the head . All parts of their heads were examined. The head examination took almost days. They were then completely X-rayed . The next part of the examination consisted of tubes being forced through their noses and into their lungs. They were then ventilated with a gas which caused them to cough so severely they had to be restrained. The sputum from the lungs was collected for examination.
The twins were then photographed for several days . The purpose of the photographs were to show hair patterns. They were each forced to stand, bend, and kneel in many positions to accomplish the photographs. For example, they were required to stand with their arms lifted for many hours so the under arm hair could be photographed.
After the photographs were finished they were awoken very early in the morning. They were taken into a room with tables and a hot water vat. The water in the vat was very hot. They were made to sit in the water until they were ready to pass out from the heat. They were then strapped to a table where their hair was plucked out trying to save the hair root. They were put back into the hot vat several times. After enough hair was collected, they were totally shaven of every hair on their body. The twins were then again extensively photographed without hair.
The twins then received several two liter enemas which caused them much pain and discomfort. The boys on different days were strapped over a bench table and their rectums were hyper descended after which they received an extensive lower gastric intestinal examination. This extensive procedure was performed without any anesthesia. The young men were crying so loud that Doctor Mengele ordered they be gagged. The next day they received a painful and humiliating urological examination. In this examination tissue samples were taken from the kidneys, prostate, and testicles. Several semen samples were forcefully taken over two days.
After this three weeks of tortuous medical examinations they were taken two the dissection laboratory. Using two doctors, each twin was simultaneously given an injection in the heart, taking their lives. They were dissected and their organs were sent to the Institute of Biological Racial and Evolutionary Research Berlin.