Résumé : Background: Patients have to acquire information to support their decision on choosing a suitable healthcare provider. But in developing countries like Vietnam, accessibility issues remain an obstacle, thus adversely affect both quality and costliness of healthcare information. Vietnamese use both sources from health professionals and friends/relatives, especially when quality of the Internet-based cheaper sources appear to be still questionable. The search of information from both professionals and friends/relatives incurs some cost, which can be viewed as low or high depending low or high accessibility to the sources. These views potentially affect their choices.Aim & Objectives: To investigate the effects that medical / health services information on perceived expensiveness of patients’ labor costs. Two related objectives are: i) establishing empirical relations between accessibility to sources and expensiveness; and, ii) probabilistic trends of probabilities for perceived expensiveness.Results: There is evidence for established relations among the variables “Convexp” and “Convrel” (all p’s < 0.01), indicating that both information sources (experts and friends/relatives) have influence on patients perception of information expensiveness. The use of experts source tends to increase the probability of perceived expensiveness.Conclusion: i) Probabilistic trends show Vietnamese patients have propensity to value healthcare information highly and do not see it as “expensive”; ii) The majority of Vietnamese households still take non-professional advices at their own risks; iii) There is more for the public healthcare information system to do to reduce costliness and risk of information. The Internet-based health service users communities cannot replace this system.