Im afraid that just because you see a new hospital, it doesn't follow that hospitals in Laos are changing.
Luang Prabang and Vientiane are quite dissimilar to the rest of the country. They cater for the ruling elite, businesses and foreigners but how good they actually are and what the cost is requires some serious, qualified research.
However just a quick visit to any regional hospital....e g. Laos second city Savanakhet will prove an eye-opener even to the most casual visitor. Anyone who can tries to make it over rhe River into Thailand. ...and Thailands healthcare leaves a lot to be desired but its still preferable to Laos.