If you are in Al-Khor, Public Health Commision in Al-khor Health Center (Infront of Al-khor bus deport) Opening time 7 am. But its better to be these at 5.30 to 6 am....
In Doha the Public health commission is in front of Waqod Petrol Station. From AIrport Signal go towards Lulu Hyper, 2nd Round about take left, go straight and after 3 rd Round about take U turn, after 200 to 300 meter you can see the Qatar Public health commission. Or else ask any karwa taxi.