Introduction

In pharmaceutical warehouses, raw material (RM) segregation is one of the most critical GMP practices. Many deviations, mix-ups, and product quality failures happen because materials are not stored according to their status. That is why every warehouse must clearly separate Approved, Quarantine, and Rejected materials.

This article explains the concept in simple, practical language — just like a senior warehouse trainer guiding a new operator. If segregation is done correctly, it prevents cross-mixing, ensures traceability, and keeps audits smooth.

Raw materials first enter quarantine after the raw material receipt process.

Definition of RM Segregation

Pharmaceutical warehouse showing segregation of raw materials in quarantine, approved (released), and rejected areas with color-coded floor markings and GMP storage layout.

Segregation of raw materials means storing materials in separate, clearly identified areas based on their quality status:

Quarantine: Material received but not yet approved by Quality Control.
Approved: Material tested and released for production use.
Rejected: Material failed testing or was found unsuitable.

The main purpose is to make sure that only approved material reaches manufacturing and no rejected or untested material enters the process.

Purpose of Segregation in GMP Warehouse

Segregation is not just about arranging pallets; it is a regulatory requirement.

Main objectives:

Prevent accidental usage of untested material.
Avoid cross-contamination and mix-ups.
Maintain traceability during audits.
Improve visual control inside the warehouse.
Ensure compliance with GMP and regulatory expectations.

In many pharma audits, inspectors first check segregation because it directly reflects warehouse discipline.

Types of RM Status and Storage Areas

1. Quarantine Area

This is the first destination after material receipt.

Characteristics:

Marked with yellow labels or quarantine status tags.
Physically separated from approved stock.
Access is controlled by the warehouse or QA.

Practical example:

After receiving API drums, warehouse staff place them in the quarantine zone until sampling and testing are completed. Even if the supplier is trusted, material cannot move to approved storage without a QC release.

Proper storage conditions for raw materials help maintain segregation integrity.

2. Approved Area

Only QC-released materials enter this area.

Key points:

Identified with green labels.
Properly racked and organized.
Used for dispensing and manufacturing.

Approved areas must be clean, organized, and arranged using FEFO or FIFO systems to prevent expiry issues.

3. Rejected Area

This area is critical but often neglected.

Requirements:

Clearly marked with red labels.
Locked or access-restricted.
Separated from the operational workflow.

Real-life GMP experience shows that mixing rejected stock with normal warehouse flow is a common audit observation. Some facilities even use cages or separate rooms to avoid mistakes.

Step-by-Step Procedure for RM Segregation (SOP Style)

Pharmaceutical warehouse RM segregation flow chart showing material receipt, quarantine labeling, QA/QC sampling, approved green label, rejected red label, status update, physical movement, and GMP documentation process.

Step 1: Material Receipt

Verify purchase order and delivery documents.
Check container condition and labeling.
Assign GRN or inward number.

Step 2: Quarantine Labeling

Attach quarantine label immediately after receipt.
Enter material details in the inventory system.
Move material to the quarantine area.

Step 3: Sampling by QA/QC

Sampling performed using approved tools.
Sample quantity recorded in logbook.
Material remains in quarantine until release.

Step 4: Status Update

After QC decision:

If passed → Replace quarantine label with approved label.
If failed → Attach rejected label.

Only QC-released material should move to dispensing, as explained in the approved material dispensing procedure.

Step 5: Physical Movement

Approved material moved to approved storage racks.
Rejected material is shifted to the rejected zone with proper documentation.

Step 6: Documentation

Update stock status in ERP or manual register.
Maintain the segregation map or location chart.

Equipment and Documents Used in Segregation

Equipment:

Pallets and pallet trucks.
Status label holders.
Floor marking tapes.
Storage racks.
Barcode scanners (if an electronic system is used).

Documents:

Goods Receipt Note (GRN).
Sampling request form.
QC release report.
Rejection note.
Inventory register or ERP system.

Advantages of Proper RM Segregation

1. Prevents Mix-Ups

Visual segregation reduces human error during dispensing.

2. Improves Audit Readiness

Auditors easily verify material flow and compliance.

3. Enhances Workflow Efficiency

Operators quickly identify usable materials.

4. Supports Traceability

Batch tracking becomes easier during investigations.

From industry experience, warehouses that follow strict segregation face fewer deviations during inspections.

Disadvantages or Risks if Segregation is Poor

Accidental use of unapproved material.
Major GMP observations.
Product recall risk.
Documentation confusion.
Increased deviations and CAPA workload.

A common real-life issue is when quarantine pallets are placed too close to approved racks, leading to wrong picking during dispensing.

Any segregation mistake must be managed through segregation errors and CAPA handling.

GMP Audit Observation & CAPA Example (Trainer Explanation)

Let’s understand this with a real-life situation.

During one GMP audit, inspectors saw that quarantine and approved raw materials were kept very close to each other. Labels were there, but the floor lines were not clear. The auditor said this can cause a big risk because an operator may pick the wrong material during dispensing.

What was the main problem?

Floor marking was faded.
Operators were depending only on small labels.
Daily checking did not include segregation verification.

What corrective actions were taken?

Warehouse repainted floor lines using GMP colors:
- Yellow – Quarantine
- Green – Approved
- Red – Rejected
Bigger status labels were introduced.
SOP updated to maintain a minimum distance between zones.

What preventive actions were added?

Weekly IPQA walk-through.
Training is given again to warehouse staff.
Double-check the system before moving materials.

👉 Tip: Small visual mistakes in segregation can become major audit findings. Always think like an auditor while arranging pallets.

Common GMP Inspection Expectations for RM Segregation (Simple Guide)

When auditors visit the warehouse, they usually check segregation first. They don’t only read SOPs — they see the floor arrangement.

Inspectors normally check:

Are quarantine materials clearly separated?
Are approved materials easy to identify?
Are rejected materials kept in a restricted area?
Are labels matching the system records?
Is there any mixing of different status materials?

From practical experience, auditors walk straight to quarantine racks because that area has a higher risk. If segregation looks clean and organized, half of the audit tension is already reduced.

👉 Tip: Good visual control makes your warehouse look GMP compliant even before documents are reviewed.

Why Strong Segregation Makes Work Easier

Segregation is not only for audit — it actually makes daily work simple.

When approved materials are stored properly:

Operators don’t waste time checking status again and again.
Dispensing becomes faster.
Chances of deviation reduce.

If quarantine or rejected material enters production by mistake, the investigation becomes long and stressful. That’s why good segregation protects both product quality and operator confidence.

👉 Tip: If a new person enters the warehouse and can understand material status just by looking at floor colors — your segregation system is working correctly.

Practical GMP Example (Real-Life Scenario)

During an internal audit in a pharmaceutical warehouse, inspectors noticed quarantine drums placed near approved API racks without floor markings. One operator mistakenly picked quarantine material for dispensing because the labels were similar.

CAPA implemented:

Separate colored floor zones.
Bigger status labels.
Dedicated quarantine rack numbering.

After the changes, picking errors reduced significantly.

Best Practices for Effective Segregation

Use color-coded labels (Green, Yellow, Red).
Maintain a minimum physical distance between zones.
Train operators regularly.
Use visual boards showing warehouse layout.
Lock rejected material areas when possible.
Perform daily status verification checks.

Comparison: Approved vs Quarantine vs Rejected

Status	Purpose	Label Color	Movement Allowed
Quarantine	Waiting for QC decision	Yellow	No production use
Approved	Released for manufacturing	Green	Yes
Rejected	Failed material	Red	Disposal or return only

Common Mistakes to Avoid

Mixing different status materials on the same pallet.
Using handwritten labels without QA approval.
Delaying status change in ERP after QC release.
Poor lighting or unclear signage in the warehouse.

FAQ – Segregation of Raw Materials

1. Why is quarantine storage mandatory in pharma warehouses?

Because materials cannot be used until QC confirms identity, purity, and compliance.

2. Can approved and quarantine materials be stored on the same rack?

No. GMP requires clear physical or visual separation to prevent mix-ups.

3. Who is responsible for changing the material status?

Quality Assurance or Quality Control approves the status change; the warehouse executes physical movement.

4. What happens to rejected material?

It is either returned to the supplier or destroyed according to the approved SOP.

5. How often should segregation areas be inspected?

Daily visual checks and periodic internal audits are recommended.

Conclusion

Segregation of raw materials into Approved, Quarantine, and Rejected areas is not just a warehouse activity — it is a core GMP control that protects product quality and patient safety. With proper labeling, clear storage zones, trained personnel, and strong documentation practices, pharmaceutical warehouses can minimize errors and maintain full regulatory compliance.

When segregation is implemented correctly, even new operators can visually understand material status without confusion, making warehouse operations safer and more efficient.

Refer to the WHO good manufacturing practice guidelines for regulatory expectations.