Former prime minister Dr Mahathir Mohamad has completed all necessary investigations for a medical check-up and will be ready to be discharged from the hospital within the next few days, the National Heart Institute said today.<br /><br />"The team of doctors treating Dr Mahathir is satisfied with results of the investigations done over the last few days"<br /><br />Mahathir was admitted to the hospital last Thursday for a full medical checkup and observation. The hospital did not say why he had been admitted.