Create sop: Standard Operating Procedure for Basic Polymerase Chain Reaction (PCR)

SOPs/SOP-LAB-001-Basic-Polymerase-Chain-Reaction-Procedure.md

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+---
+title: "Standard Operating Procedure for Basic Polymerase Chain Reaction (PCR)"
+author: ""
+date: 2026-03-10
+version: "1.0"
+status: "Draft"
+---
+
+## 1. Purpose
+
+The purpose of this Standard Operating Procedure (SOP) is to define the standardized method for performing a basic Polymerase Chain Reaction (PCR) for DNA amplification in a controlled laboratory environment.  
+
+This procedure ensures:
+- Consistent and reproducible PCR results  
+- Compliance with ISO 9001 and ISO 13485 quality management requirements  
+- Data integrity in accordance with FDA 21 CFR Part 11 (where electronic systems are used)
+
+---
+
+## 2. Scope
+
+This SOP applies to all laboratory technicians performing basic PCR procedures within the laboratory facility.
+
+This procedure covers:
+- Preparation of reagents and master mix  
+- Sample handling  
+- Thermal cycler setup  
+- Amplification process  
+- Post-PCR handling  
+- Documentation and data recording  
+
+This SOP does not cover:
+- Quantitative PCR (qPCR)  
+- Reverse transcription PCR (RT-PCR)  
+- Advanced assay validation  
+
+---
+
+## 3. References
+
+- ISO 9001: Quality Management Systems – Requirements  
+- ISO 13485: Medical Devices – Quality Management Systems  
+- FDA 21 CFR Part 11 – Electronic Records and Electronic Signatures  
+- Laboratory Biosafety Manual ""  
+- Equipment Manual: Thermal Cycler Model ""  
+
+---
+
+## 4. Definitions
+
+| Term | Definition |
+|------|------------|
+| PCR | Polymerase Chain Reaction, a method used to amplify DNA sequences |
+| Master Mix | A premixed solution containing DNA polymerase, dNTPs, buffer, and MgCl₂ |
+| Template DNA | DNA sample containing the target sequence |
+| NTC | No Template Control |
+| Thermal Cycler | Instrument used to automate PCR temperature cycling |
+
+---
+
+## 5. Roles and Responsibilities
+
+| Role | Responsibility |
+|------|---------------|
+| Laboratory Technician | Perform PCR according to this SOP and document all activities |
+| Laboratory Supervisor | Ensure training, review records, and approve deviations |
+| Quality Assurance | Ensure compliance with QMS and regulatory requirements |
+
+---
+
+## 6. Safety and Environmental Considerations
+
+- Wear appropriate PPE: lab coat, gloves, and eye protection.
+- Handle biological samples in accordance with biosafety guidelines.
+- Use aerosol-resistant pipette tips.
+- Dispose of biological and chemical waste according to laboratory waste procedures "".
+- Avoid cross-contamination by maintaining separate pre- and post-PCR areas.
+
+---
+
+## 7. Equipment and Materials
+
+### 7.1 Equipment
+
+| Equipment | Model | ID No. | Calibration Due Date |
+|-----------|-------|--------|----------------------|
+| Thermal Cycler | "" | "" | "" |
+| Microcentrifuge | "" | "" | "" |
+| Micropipettes | "" | "" | "" |
+| Vortex Mixer | "" | "" | "" |
+
+### 7.2 Reagents and Consumables
+
+| Item | Manufacturer | Lot No. | Expiry Date |
+|------|-------------|----------|------------|
+| PCR Master Mix | "" | "" | "" |
+| Forward Primer | "" | "" | "" |
+| Reverse Primer | "" | "" | "" |
+| Template DNA | "" | "" | "" |
+| Nuclease-Free Water | "" | "" | "" |
+| PCR Tubes/Plates | "" | "" | "" |
+
+---
+
+## 8. Procedure
+
+### 8.1 Pre-Procedure Checks
+
+- Verify equipment calibration status.
+- Confirm reagent integrity and expiration dates.
+- Thaw reagents on ice.
+- Prepare a clean PCR workstation.
+- Record reagent lot numbers in the PCR worksheet.
+
+---
+
+### 8.2 Preparation of Master Mix
+
+1. Calculate total reaction volume and number of reactions, including:
+   - Test samples  
+   - Positive control  
+   - NTC  
+   - 10% excess volume to account for pipetting error  
+
+2. Prepare master mix according to assay design:
+
+| Component | Volume per Reaction (µL) | Final Concentration |
+|------------|--------------------------|---------------------|
+| Master Mix | "" | "" |
+| Forward Primer | "" | "" |
+| Reverse Primer | "" | "" |
+| Nuclease-Free Water | "" | "" |
+
+3. Mix gently by pipetting or brief vortex.
+4. Centrifuge briefly to collect contents.
+
+---
+
+### 8.3 Reaction Setup
+
+1. Label PCR tubes clearly.
+2. Aliquot appropriate volume of master mix into each tube.
+3. Add template DNA to designated tubes.
+4. Add nuclease-free water to NTC.
+5. Cap tubes securely.
+6. Briefly centrifuge to remove air bubbles.
+
+---
+
+### 8.4 Thermal Cycler Programming
+
+Program the thermal cycler as follows:
+
+| Step | Temperature (°C) | Time | Cycles |
+|------|------------------|------|--------|
+| Initial Denaturation | "" | "" | 1 |
+| Denaturation | "" | "" | "" |
+| Annealing | "" | "" | "" |
+| Extension | "" | "" | "" |
+| Final Extension | "" | "" | 1 |
+| Hold | "" | "" | 1 |
+
+- Verify correct program selection before starting.
+- Record program name and run ID in the PCR worksheet.
+
+---
+
+### 8.5 PCR Run
+
+- Place tubes in thermal cycler.
+- Close lid securely.
+- Start run and confirm program initiation.
+- Record run start and end times.
+
+---
+
+### 8.6 Post-PCR Handling
+
+- Remove tubes after completion.
+- Store amplified products at "" °C if required.
+- Proceed to downstream analysis if applicable (e.g., gel electrophoresis).
+- Decontaminate work surfaces.
+
+---
+
+## 9. Quality Control
+
+- Include positive control and NTC in each run.
+- Acceptable result criteria:
+
+| Control | Expected Result | Acceptance Criteria |
+|----------|----------------|--------------------|
+| Positive Control | Amplification observed | Clear expected band |
+| NTC | No amplification | No visible band |
+
+- Document deviations and notify supervisor if acceptance criteria are not met.
+- Initiate Nonconformance Report (NCR) if required.
+
+---
+
+## 10. Documentation and Records
+
+The following records must be completed:
+
+- PCR Worksheet ""  
+- Equipment Logbook  
+- Reagent Log  
+- Deviation Report (if applicable)  
+
+For electronic records:
+- Ensure user access control is maintained.
+- Electronic signatures must comply with FDA 21 CFR Part 11.
+- Audit trails must be enabled where applicable.
+
+Records retention period: "" years.
+
+---
+
+## 11. Deviations and Corrective Actions
+
+- Any deviation from this SOP must be documented.
+- Notify Laboratory Supervisor immediately.
+- Perform root cause investigation if required.
+- Implement corrective and preventive actions (CAPA) per procedure "".
+
+---
+
+## 12. Training Requirements
+
+- Personnel must be trained on this SOP prior to performing PCR independently.
+- Training records must be maintained.
+- Competency assessment frequency: "".
+
+---
+
+## 13. Change History
+
+| Version | Date | Description of Change | Author |
+|----------|------------|----------------------|--------|
+| 1.0 | 2026-03-10 | Initial draft | "" |
+
+---
+
+## 14. Approval Signatures
+
+| Name | Title | Signature | Date |
+|------|-------|------------|------|
+| "" | Laboratory Supervisor |  |  |
+| "" | Quality Assurance |  |  |
+| "" | Laboratory Manager |  |  |