Aug 21, 2026Quality Inspection Guides
The right quality-control service depends on the question you need answered and the current stage of your order.
Not sure which quality inspection service you need in China? Learn when to use factory audit, IPC, DPC, FRI, loading supervision, sample picking, and other quality control services.
How to Choose the Right Quality Inspection Service for Your Order
You may know that you need independent verification in China, but that does not automatically tell you which service to arrange. The correct choice depends on what you need to know now.
You may need to understand whether a new supplier can support the order, whether production started with the correct materials, whether finished goods meet your requirements, or whether the correct cartons are being loaded. Each question belongs to a different stage and requires different evidence.
The practical starting point is simple: define the decision you need to make, then select the service that can provide the missing information.
Start With the Question You Need Answered
A typical order moves through several control points: supplier -> sample -> start of production -> bulk production -> finished goods -> loading. Sample selection and laboratory testing may be added when a separate material or performance question needs to be verified.
Before production, the focus is capability and a clear production reference. Once work begins, the focus moves to materials, first production pieces, progress, and consistency. Near shipment, the question becomes whether the actual finished goods and loading condition are acceptable.
From our experience, choosing the stage first prevents a common mismatch: arranging a finished-goods inspection when the real concern is supplier capability, or arranging a factory audit when the decision depends on the quality of one completed shipment.
Before a Significant Order: Factory Audit
The question at this stage is: Can this supplier support my order?
A Factory Audit Service is relevant when you have limited information about a new factory, plan customized or longer-term production, or need to understand capacity, equipment, organization, and quality-management practices before relying on the supplier.
An audit evaluates the supplier and its production setup. It does not confirm that a future shipment will meet your approved requirements. If you are deciding between checking the factory and checking the goods, Factory Audit vs Product Inspection: Which One Do You Need? explains the difference in more detail.
Before Mass Production: Pre-Production Sample Review
The question here is: Is the production reference clear enough for bulk manufacturing?
A Pre-Production Sample Review Service reviews the supplier's sample against the available reference documents, comments, and requirements you provide. These may cover materials, dimensions, construction, workmanship, packaging details, or other points that need confirmation before bulk production.
The review is especially useful after several sample revisions. It can identify whether an old comment remains unresolved or whether the factory and your team are referring to different sample versions. Approval establishes the reference; it does not guarantee that every bulk unit will match it.
At the Start of Production: Initial Production Check (IPC)
Once production begins, the question changes: Has the factory started with the correct materials, components, setup, and requirements?
An Initial Production Check (IPC) Service is carried out near the beginning of production, when raw materials, components, packaging materials where available, and first production pieces can be checked against the confirmed order information.
IPC is most useful when an early correction can prevent the same issue from continuing across the full order. It differs from DPC mainly in timing: IPC checks how production has started, while DPC examines meaningful bulk output and the direction of the running order.
While Production Is Running: During Production Check (DPC)
At this stage, the question is: Is bulk production moving in the right direction while there is still time to act?
During a During Production Check (DPC) Service, the inspector records actual production progress and selects available pieces for checks against your requirements. The scope may cover workmanship, measurements, printing, assembly, materials, consistency, and early packing, depending on the product and your main risks.
The value of DPC is timing. If a repeated assembly problem or measurement deviation is found while part of the order is still in production, the factory can review both completed and unfinished quantities. During Production Check (DPC) vs Final Random Inspection (FRI): What One Do You Need? can help you decide whether that earlier visibility is necessary for your order.
Before Shipment: Final Random Inspection (FRI)
Before release, the practical question is: Do the finished goods meet my requirements in their current shipment condition?
A Final Random Inspection (FRI) Service is commonly used as a pre-shipment inspection when production is completed and the goods are sufficiently packed for representative random sampling. Samples are selected from the available shipment rather than limited to pieces prepared in advance by the factory.
The checks are defined by the product and your confirmed requirements. They may include appearance, workmanship, measurements, basic functions, labels, accessories, packaging, quantity, and defect classification. FRI verifies the finished shipment; it cannot provide the earlier correction window of DPC.
If this is your first inspection, How to Prepare for a Pre-Shipment Inspection explains what information to provide. The AQL Sampling Plan article explains how sample quantity is selected, while How to Read a Pre-Shipment Inspection Report helps you use the findings for your shipment decision.
During Loading: Container Loading Supervision (CLS)
After finished-goods verification, a different question may remain: Are the correct goods and quantities actually being loaded properly?
Container Loading Supervision (CLS) Service can record the container condition, loading quantity, carton condition and identification, loading process, and sealing information. This is useful when shipment mix, carton count, handling, or loading evidence is the main concern.
CLS does not replace an FRI. Loading supervision follows cartons through loading, but it does not examine product quality in the same depth as random finished-goods checks.
When the Sample Must Come From Actual Production
Sometimes the question is not whether the whole shipment passes. It is: Did the sample come from the production batch I need to verify?
With Sample Picking Service, an independent inspector selects samples from the specified production lot, records the selection, and can witness sealing or dispatch according to the agreed arrangement. This helps preserve traceability for buyer review, laboratory testing, complaint investigation, or production verification.
Witness sampling is important when you need evidence that the reviewed or tested item represents the stated batch. Sample picking answers whether the correct sample was selected; it does not produce a formal laboratory result.
When Product Performance Requires Formal Testing
A factory-floor check cannot answer every performance or material question. If your decision depends on a formal test standard, the sample needs to be tested by a qualified laboratory using the required method.
Lab Testing Assistance Service can support sample selection and coordination with an independent laboratory. The laboratory performs the test and issues the formal result; GD Inspection does not claim to perform the laboratory test itself.
This distinction matters because inspection and laboratory testing answer different questions. On-site checks show the condition of sampled goods against the agreed scope. Laboratory testing verifies a specified property under controlled test conditions.
When the Shipment Is Prepared for E-Commerce
For a private-label or online retail order, the product may also need to be ready for e-commerce fulfilment and direct delivery to the end customer.
An E-commerce Inspection Service adapts the inspection priorities to customer-facing and fulfilment requirements, such as retail appearance, labels, barcodes, accessories, packaging, product consistency, and defects likely to lead to returns.
It is not a separate quality-control system. It is a product inspection with the scope adjusted to the way your e-commerce shipment will be received, stored, listed, and delivered.
Quick Decision Guide
Use the question in the left column as the starting point. The final scope still depends on the product, order status, and risk you need to verify.
Your main question | Relevant service |
|---|---|
Can this supplier support my order? | Factory Audit |
Is the production reference ready? | Pre-Production Sample Review |
Did production start correctly? | Initial Production Check (IPC) |
Is bulk production moving correctly? | During Production Check (DPC) |
Are finished goods acceptable before shipment? | Final Random Inspection (FRI) |
Are the correct goods being loaded properly? | Container Loading Supervision (CLS) |
Did the sample come from the actual production batch? | Sample Picking |
Does the product meet a formal test requirement? | Lab Testing Assistance |
Does the shipment meet e-commerce presentation and fulfilment requirements? | E-commerce Inspection |
You May Need More Than One Check, But Not Always
A customized product with a new supplier and expensive rework may justify a sequence such as Factory Audit -> Pre-Production Sample Review or IPC -> DPC -> FRI. Each step answers a new question as the order moves forward; the sequence is not useful if the same information is simply repeated.
A repeat order from a stable supplier may only need FRI before shipment. If your only unresolved concern is a formal performance requirement, Sample Picking plus Lab Testing Assistance may be enough. The plan should reflect supplier history, product complexity, order value, customization, previous defects, and the consequence if the requirement is not met.
How GD Inspection Helps You Choose the Stage
To discuss the appropriate scope, you can provide the product, current order stage, supplier situation, main concern, and any previous quality issues. That information makes it possible to identify which question needs independent evidence and when it can be checked.
The useful service is not automatically the most comprehensive option. It is the one that gives you the information required for your next decision without checking the wrong stage of the order.
Frequently Asked Questions
Which inspection is most commonly used before shipment?
Final Random Inspection is the most common choice when finished goods need to be verified before shipment. It is a form of pre-shipment inspection based on random sampling and the requirements agreed for the order.
Do I need both a factory audit and a product inspection?
Not always. A factory audit helps you understand supplier capability and management, while a product inspection checks actual goods at a defined production stage. You may use both for a significant new project, or only the one that answers your current question.
Do I need DPC if I already plan to arrange FRI?
DPC is useful when the product is new, complex, difficult to rework, or has known risks that should be checked while production is still running. If the order is routine and the main decision concerns finished goods before release, FRI may be sufficient.
Can one inspection cover everything?
No single visit can fully answer supplier capability, early production, finished-goods quality, loading, sample traceability, and laboratory performance. These checks use different evidence and occur at different times.
How do I know which service is right for my order?
Write down the decision you need to make and the risk that could change that decision. Then match it to the current stage: supplier, sample, early production, running production, finished goods, loading, or formal testing.
Choose the Information You Need Next
You do not need every available quality-control service. Factory Audit helps you understand the supplier. Pre-Production Sample Review and IPC clarify the production reference and start. DPC provides earlier production visibility. FRI verifies finished goods, while CLS records loading. Sample Picking and laboratory support answer specific traceability and performance questions.
The right inspection plan gives you enough reliable information to make the next sourcing decision at the right time.