Every specimen has one thing in common: it is only as reliable as the conditions it experiences before testing.

From the moment a sample is collected until it reaches the laboratory, maintaining the proper temperature is essential to preserving specimen integrity and supporting accurate diagnostic results. Whether specimens move through a medical courier network or travel directly from a patient’s home to the laboratory, temperature excursions during transport can lead to compromised samples, recollection requests, delayed results, and unnecessary costs.

One of the most effective ways to reduce that risk is selecting the right temperature-control solution for each application.

Rather than relying on a one-size-fits-all approach, laboratories and healthcare organizations can use Phase Change Material (PCM) technology to maintain specific temperature ranges based on the specimen’s transport requirements.

Why Temperature Control Matters During Specimen Transport

The pre-analytical phase accounts for the majority of variability within laboratory testing. Collection, packaging, transportation, storage, and handling all occur before analysis begins, making transport one of the most important opportunities to protect sample quality.

Different specimen types require different transport temperatures:

• Frozen specimens often require temperatures below -70°, -20°C, or  -5°C
• Refrigerated specimens typically require 2–8°C.
• Controlled Room Temperature (CRT) specimens generally require 15–25°C.
• Ambient specimens often require 2–30°C.

Using packaging that matches these validated temperature requirements helps reduce excursion risk while improving consistency throughout the transport process.

PCM Packs: Built for Specific Temperature Requirements

Unlike traditional gel packs, PCM packs are engineered with a defined phase change temperature. This allows them to help maintain a much more stable shipping environment during transport.

At Akuratemp, savENRG® PCM Packs are available for multiple temperature profiles commonly used throughout laboratory logistics.

Freezer Packs (-10°C)

Some biological materials and specialty laboratory specimens require frozen transport to preserve stability during transit. Applications may include:

• Certain molecular diagnostics
• Frozen plasma
• Specialized research specimens
• Biopharmaceutical materials

Freezer PCM Packs are a safe & reusable alternative to dry ice to support frozen shipping profiles while reducing temperature variability during transport.

Cool Packs (+5°C)

Many diagnostic specimens require refrigerated transportation between 2–8°C. Examples include:

• Blood specimens
• Plasma and serum samples
• Microbiology specimens
• Molecular diagnostics
• Immunology specimens

Cool Packs are designed to support refrigerated transport conditions keeping the samples above +2°C in winter and below +8°C in summer that help preserve specimen quality from collection through laboratory receipt.

CRT Packs (+18°C) and Ambient Packs (+22°C)

Not every specimen should be refrigerated.

Many laboratory products and diagnostic materials perform best within Controlled Room Temperature (CRT) conditions, typically between 15–25°C.

CRT Packs help protect shipments from overcooling ie keeping them above +15°C during winter periods.Typical applications include:

• Clinical trial materials
• Diagnostic reagents
• Certain pharmaceuticals
• Laboratory kits requiring controlled room temperature

Selecting the appropriate PCM temperature profile helps ensure products remain within their validated shipping conditions.

Supporting Both Courier Networks and Direct-to-Patient Testing

Healthcare logistics continue to evolve beyond traditional courier routes. Today, laboratories often manage multiple transportation models simultaneously, including:

Last-Mile Medical Courier Transport

Medical courier networks move specimens between:

• Physician offices
• Hospitals
• Collection centers
• Reference laboratories

These routes often involve multiple pickups, frequent handoffs, changing outdoor temperatures, and varying transit times. Proper PCM selection helps maintain stable temperatures throughout each leg of the journey.

Direct-to-Patient Collection Kits

Home-based diagnostic testing continues to expand across healthcare. Patients now collect and return specimens from home for services including:

• Genetic testing
• Cancer Screening
• Infectious disease testing
• Blood  screening
• Clinical research

These kits often spend extended periods in parcel networks where outdoor conditions and transit durations can vary significantly.

Choosing the correct PCM pack helps improve temperature stability from the patient’s home through laboratory delivery.

Choosing the Right PCM Pack for Every Specimen

There is no universal temperature-control solution for every specimen. Instead, successful transport programs evaluate:

• Required transport temperature
• Expected transit duration
• Shipping environment
• Packaging configuration
• Seasonal temperature conditions

Using the correct PCM technology for each application helps reduce specimen risk while improving transport consistency across an entire laboratory network.

Visit Akuratemp at ADLM

As specimen transportation continues to evolve, laboratories are looking for packaging solutions that improve temperature control without adding complexity to their workflows.

If you’re attending ADLM 2026 in Anaheim, CA from July 26th – 30th, stop by the Akuratemp booth to learn how savENRG® PCM Packs can support frozen, refrigerated, controlled room temperature, and ambient specimen transport for both medical courier operations and direct-to-patient testing programs.

Our team will be available to discuss real-world transport challenges, packaging design, validation support, and temperature-control strategies tailored to your operation.

We look forward to connecting with you at Booth #944.