## Structural Distinction: PHC vs Sub-centre ### Key Organizational Differences **Key Point:** The presence of a **functional laboratory with basic diagnostic capability** is the defining structural feature that separates a PHC from a Sub-centre. ### Comparative Table | Feature | Sub-centre (SC) | Primary Health Centre (PHC) | | --- | --- | --- | | **Laboratory** | None; relies on PHC/CHC | Basic lab with microscopy, blood testing, urine analysis | | **Staffing** | 1 ANM (female) + 1 MPW(M) | 1 ANM + 1 Auxiliary Nurse Midwife (ANM) + 1 Multipurpose Worker (Male) | | **Population coverage** | 3,000–5,000 (hilly/tribal); 5,000–10,000 (plain) | 4,000–10,000 (hilly/tribal); 10,000–20,000 (plain) | | **Inpatient beds** | None | 4–6 beds (maternity, general) | | **Diagnostic capacity** | Presumptive diagnosis only | Confirmatory diagnosis (microscopy, basic serology) | | **Referral role** | Peripheral outpost | First point of clinical decision-making | ### High-Yield Concept **High-Yield:** The **laboratory function** is the critical structural threshold. A Sub-centre is essentially a **field outpost** with no diagnostic infrastructure; a PHC is a **mini-hospital** with basic investigation capability. This allows the PHC to: - Confirm presumptive diagnoses (malaria, TB, pregnancy complications) - Provide evidence-based referral decisions - Serve as the first-contact point for curative care ### Clinical Pearl **Clinical Pearl:** In rural India, the PHC laboratory is often the only reliable microscopy facility within 10–15 km. This makes it the functional gateway between community-level prevention (SC) and secondary care (CHC). [cite:Park 26e Ch 3]
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