Our expert says:
All operations are risky, what the anaethetist tries to do with the blood tests is to identify possible risk areas and to be prepared to handle all complications that can develop in these areas. They check the kidney function, try to identify possible bacterial infections, check the red blood cell count ( they lose a lot of blood with the operation). He will also monitor her blood pressure and sugar levels closely during the operation and even give her insulin and a sugar drip if needed. They can see whether the patient is "awake" by monitoring her pulse, blood pressure and tearing in the eyes - trust me, if you are awake and scared, your blood pressure and pulse will go up suddenly! These episodes do happen but are very rare indeed. It sounds as if she has a doctor that is taking all the necessary precautions. One has to weigh up the risk of the operation with the benefit it is going to give her - not doing it may cause her to end up in a wheelchair. One also wants to do this earlier rather than later in life.
Let me know how the operation went?
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