I arrived in Doha September 2013 and did all the medicals all was oky. bad luck the person guiding us failed us and 2 weeks ago I left for 10 days to attest my child birth certificate. all is approved now and we get 5 years family visa. my question is, are our medical still valid or do we need to re-do all again in order to get Qatar fingerprint and Id?
Have a look at our Visas for Qatar page. As far as I know you do need to have passed a medical in order to go for fingerprinting, yes. Check this with your closest Qatari embassy, but to my mind if you failed the first test, the only hope you would have would be to go for a second time. It is important to note that if an applicant has hepatitis, TB or HIV they will not pass the medical.
Good luck with this
Xavier