Establishments primarily engaged in providing professional analytic or diagnostic services to the medical profession, or to the patient on prescription of a physician.
- Bacteriological laboratories (not manufacturing)
- Biological laboratories (not manufacturing)
- Blood analysis laboratories
- Chemists, biological: (not manufacturing) laboratories of
- Dental laboratories, X-ray
- Medical laboratories, clinical
- Pathological laboratories
- Testing laboratories, medical: analytic or diagnostic
- Urinalysis laboratories