Product hold time is one of the most overlooked costs in food, dietary supplements, botanicals, and natural products manufacturing. While microbial testing is essential for ensuring product safety and regulatory compliance, waiting several days for laboratory results can create a costly bottleneck.
Fortunately, advances in molecular testing have made it easier than ever for manufacturers to perform routine microbial testing in-house. By eliminating shipping delays and accelerating the testing process, facilities can significantly reduce product hold time while maintaining confidence in product quality.
In this article, we’ll explore what product hold time is, why it matters, and how bringing microbial testing in-house can help manufacturers get products to market faster.
What Is Product Hold Time?
Product hold time refers to the period between when a product is manufactured and when it can be released for distribution.
For many manufacturers, finished products cannot be shipped until microbial testing confirms they meet safety specifications.
During this hold period, products typically remain in storage while quality teams wait for laboratory results.
Although this waiting period may only last a few days, the impact extends across the entire operation.
Products sitting in inventory are products that:
- Cannot generate revenue
- Occupy warehouse space
- Delay customer shipments
- Tie up working capital
- Slow production schedules
The longer products remain on hold, the greater the operational and financial impact.
Why Product Hold Time Matters
At first glance, waiting days for laboratory results may not seem significant.
However, manufacturers often produce multiple batches each week—or even each day.
If every batch spends several days waiting for microbial clearance, inventory quickly accumulates.
This can create challenges such as:
- Limited warehouse capacity
- Increased storage costs
- Delayed order fulfillment
- Cash flow constraints
- More complex inventory management
For growing manufacturers, reducing hold time often becomes one of the fastest ways to improve operational efficiency without increasing production capacity.
Why Outsourced Testing Extends Hold Times
Many facilities rely on third-party laboratories for microbial testing.
While outside laboratories provide valuable expertise and specialized services, the testing process introduces several unavoidable delays.
Typical outsourced testing includes:
- Sample collection
- Packaging
- Shipping
- Laboratory intake
- Sample preparation
- Analysis
- Data review
- Final report generation
Each step adds time before products can be released.
Even when laboratory turnaround is relatively fast, shipping alone can consume an entire day. Unexpected shipping delays, weekends, holidays, or laboratory backlogs can extend the timeline even further.
As a result, finished products often remain on hold much longer than the actual laboratory analysis requires.
How In-House Testing Changes the Timeline
Bringing microbial testing in-house removes several of the longest steps in the testing process.
Instead of preparing shipments and waiting for samples to arrive at an external laboratory, quality teams can begin testing immediately.
That means eliminating:
- Shipping time
- Courier scheduling
- Laboratory intake delays
- Sample transportation risks
By keeping testing within the facility, manufacturers gain faster access to critical quality data and can make product release decisions sooner.
Faster Results Mean Faster Product Release
The primary benefit of in-house microbial testing is speed.
Rather than waiting days for results from an outside laboratory, internal testing allows quality teams to evaluate products much sooner.
Faster results allow manufacturers to:
- Release finished goods earlier
- Reduce warehouse congestion
- Improve order fulfillment
- Meet customer deadlines
- Increase production flexibility
For companies producing high volumes of products, even reducing hold times by one or two days can have a measurable impact on operations.
Better Inventory Management
Finished products waiting for laboratory clearance consume valuable warehouse space.
As hold times increase, so does inventory.
Large inventories often require:
- Additional storage
- More inventory tracking
- Increased handling
- Higher insurance costs
- Greater warehouse labor
Reducing product hold time allows inventory to move through the facility more efficiently.
Instead of accumulating on warehouse shelves, products move into distribution sooner, creating additional capacity without expanding warehouse space.
Improved Cash Flow
One of the biggest financial benefits of reducing product hold time is improved cash flow.
Products sitting in storage represent capital that cannot yet be recovered.
The sooner products are released, the sooner they can:
- Ship to customers
- Be invoiced
- Generate revenue
- Improve working capital
For growing manufacturers, accelerating product release can strengthen overall financial performance without increasing production volume.
More Responsive Manufacturing
Manufacturing schedules rarely remain static.
Customer demand changes.
Production priorities shift.
Unexpected issues arise.
Long testing turnaround times make it difficult to respond quickly.
When microbial testing occurs in-house, quality teams gain immediate access to testing capabilities whenever production requires them.
This flexibility supports:
- Faster production adjustments
- Quicker investigations
- Better scheduling decisions
- Reduced downtime
Instead of waiting for outside laboratory availability, manufacturers maintain greater control over their own operations.
Earlier Detection Leads to Faster Corrective Action
In-house microbial testing doesn’t just accelerate product release—it also speeds problem-solving.
When contamination is identified sooner, quality teams can investigate immediately.
Faster detection helps manufacturers:
- Identify contamination sources
- Verify sanitation effectiveness
- Prevent recurring issues
- Minimize production disruptions
Rather than discovering problems several days later after receiving laboratory reports, facilities can begin corrective actions while production details are still fresh.
This responsiveness helps strengthen the overall quality management system.
Routine Testing Becomes Easier
One advantage of having testing capabilities on-site is the ability to perform routine verification more frequently.
Manufacturers can more easily test:
- Incoming raw materials
- Environmental samples
- Processing equipment
- Finished products
- Sanitation effectiveness
Because testing is readily available, quality teams can gather more data and make more informed decisions without the added cost and logistics of repeatedly shipping samples to an outside laboratory.
More frequent testing also supports a proactive approach to food safety and quality assurance.
Modern Molecular Testing Makes In-House Testing More Accessible
Historically, bringing microbial testing in-house required significant investments in microbiology laboratories, specialized equipment, and experienced laboratory staff.
Traditional culture-based methods often involved lengthy incubation periods, multiple manual steps, and complex laboratory workflows.
Today’s molecular technologies have dramatically changed what’s possible.
Modern qPCR testing platforms provide:
- Rapid microbial detection
- Simplified workflows
- High sensitivity
- Consistent performance
- Scalable testing solutions
These advancements make it much more practical for manufacturers to establish routine in-house microbial testing without the complexity associated with traditional microbiology laboratories.
Why This Matters for Supplement and Botanical Manufacturers
Manufacturers of dietary supplements, botanicals, and natural products face unique quality challenges.
Many ingredients originate from agricultural environments where naturally occurring microorganisms are common.
At the same time, consumers and regulators expect products to meet strict safety standards.
Reducing product hold time while maintaining confidence in microbial testing is particularly valuable in these industries.
Companies like Medicinal Genomics have helped lead this transformation by automating their method using the BMS Myra Liquid Handler and Mic qPCR Cycler.
This streamlined workflow means manufacturers of food, dietary supplements, botanicals, and natural products don’t need to build large traditional microbiology labs. They can establish efficient, compliant testing programs using equipment designed for speed, consistency, and ease of use.
Should Every Manufacturer Bring Testing In-House?
Not necessarily.
Facilities with relatively low testing volumes or highly specialized analytical needs may continue to benefit from third-party laboratory partnerships.
However, manufacturers should consider bringing routine microbial testing in-house if they:
- Frequently experience product release delays
- Conduct high volumes of microbial testing
- Want faster production decisions
- Are looking to improve inventory turnover
- Need greater operational flexibility
- Want to reduce long-term testing costs
Final Thoughts
Product hold time is often viewed as an unavoidable part of manufacturing, but it doesn’t have to be. Every day products spend waiting for microbial test results represents delayed shipments, tied-up inventory, and slower cash flow. While third-party laboratories remain an important resource for specialized analyses, relying on outsourced testing for routine microbial screening can create unnecessary delays that ripple throughout the production process.
By bringing microbial testing in-house, manufacturers gain greater control over product release timelines, improve inventory management, and respond more quickly to quality concerns. Advances in qPCR testing have made this transition more achievable than ever, providing rapid, accurate microbial detection through simplified workflows that fit seamlessly into modern manufacturing environments.
For manufacturers of food, dietary supplements, botanicals, and natural products, reducing product hold time isn’t just about moving products faster—it’s about building a more agile, efficient, and resilient quality assurance program. With solutions like those developed by Medicinal Genomics, companies can streamline routine microbial testing, accelerate decision-making, and confidently deliver safe, high-quality products to market faster than ever before.
