筛查 shāichá to screen (for disease etc)
How to remember 筛查: 筛 screen + 查 to check = to screen (for disease etc).
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How it is used
- To screen a population for a disease or problem - 癌症筛查 (áizhèng shāichá) cancer screening; 核酸筛查 nucleic-acid screening.
- 筛 = to sieve, so it implies sifting many to catch the few; medical/public-health register.
- Distinguish from 检查 (jiǎnchá, examine/inspect generally): 筛查 is mass, preventive screening.