Timings suck! You need to be there before the center opens. literally! they might tell you otherwise but perhaps when you go there they will ask you to come again next morning. this is the state of customer service in Qatar and we cannot do anything about it.

About where to visit after obtaining the card, you can only visit the Primary Health center (PHC) mentioned on your card.

You can visit Hammad Hospital only in case of real emergencies.

For children, you can also visit the Paedriatic center on Al-Sadd but be preapred for long queues.

For other hospitals like rumeilah etc, you need to obtain referal from the PHC. Also applies for visiting Hammad for non-emergency situations.

Hope this helps.