详查 is a compound verb meaning 'to investigate thoroughly' or 'to examine in detail.' The first character, 详 (xiáng), means 'detailed,' 'thorough,' or 'in-depth,' while the second, 查 (chá), means 'to check,' 'to inspect,' or 'to investigate.' Together, they emphasize careful, systematic scrutiny — not just a quick glance but a methodical review of facts, evidence, or conditions. It’s commonly used in formal, professional, or official contexts such as medical diagnosis, legal investigations, quality control, or academic research.

The word carries a tone of seriousness and responsibility: using 详查 implies that accuracy and completeness matter, often because consequences depend on the findings. It frequently appears after subjects like doctors, investigators, auditors, or government agencies, and may be followed by an object (e.g., 病因, 案件, 文件) or introduced with 把 or 要. While it can appear in written and spoken Chinese, it’s more common in formal reports, news, or official communications than in casual daily speech.