紹介状

1. Origins, structure, and basic meaning

• Structure: 紹介状 is read as しょうかいじょう and means “letter of introduction” and “medical referral”.
• Basic usage: It denotes a letter introducing someone to a research institute and a medical referral to another hospital.

2. Common pitfalls and similar expressions

• Key distinction: 紹介状
  • It can be a general letter of introduction or a medical referral; the destination and purpose determine the sense.