The doctors who want to attend the seminar or conferences in the USA should apply for Business visa.

The following are the documents which are required to apply for the Business Visa:

• Valid travel document (minimum validity of 6 months at the time of departure from Singapore);
• Complete an application form (Form 14) and letter of introduction (Form V39A) together with 2 recent passport-sized colour photographs. Please note that the photograph must be 35 mm by 45 mm without border and taken within the last 3 months. It has to be taken full face without headgear (unless the applicant habitually wears a headgear in accordance with his/her religious or racial custom but the headgear must not hide the applicant's features). The facial image must be between 25 mm and 35 mm from chin to crown taken against a plain white background. The photograph finishing should be matt or semi-matt.
  Please ensure that your form is properly completed. Any incomplete submission or false declaration will result in the application being rejected;
• Onward or return ticket (if applicable);
• Valid entry visa to the next destination;
• Sufficient funds for the period of stay in Singapore;
• For Nationals of Assessment Level II Countries: Ensure that your passport have at least one blank page for the visa to be pasted on.

For further information, please go through the following website: