Which type of blood text I will do before I can...

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Do you need to do any blood test before work ?
most of cases , you wont need medical tests for work if you are working in your own country , but its still possible to do some medical test in some cases 
What cases require medical tests ?
1. work abroad and getting visa ( required either in your home country before getting the visa or in the other country you will work in 
2. health industry 
3. food industry 
What is the possible medical tests that are required ?
1. transmitted disease such as AIDS and hep B and hep C 
2. body function for elders or suspected workers such as : heart function test 
3. drugs levels test 
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