International Shipping & Customs Guide for Genetic Testing Kits

Genetic testing companies ship two things across a border: the empty collection kit going to you, and your biological sample going back to the lab. Both legs can encounter friction that a typical consumer package wouldn't, because biological materials — even something as low-risk as saliva — sometimes fall under different customs classifications and documentation requirements than ordinary goods.

What Actually Slows Things Down

• Customs declarations and classification. Biological samples typically need to be declared accurately (often as a non-infectious diagnostic specimen), and misclassified or vaguely labeled packages are exactly what gets flagged for manual customs inspection, adding days or weeks.
• Country-specific import restrictions. Some countries have specific rules or required permits for importing biological samples or exporting them for sequencing abroad — this varies significantly by destination and isn't always obvious from a testing company's website, which may be written primarily for a domestic audience.
• Temperature and handling requirements. Saliva-based collection kits (the most common format) are generally shelf-stable at room temperature for shipping, which is one reason they've become the default over blood-based kits for consumer testing — blood samples typically require more controlled handling and are more likely to face complications in transit.
• Return shipping logistics. Getting the kit to you is only half the trip — the completed sample also has to make it back to the lab, sometimes to a different country than where you received the kit, which is a second opportunity for customs delays.

Practical Steps to Avoid Delays

• Provide a complete, accurate shipping address including any apartment/unit numbers or local addressing conventions customs forms require — incomplete addresses are a common, avoidable cause of delay.
• Check whether your country has import duties or taxes that could apply, so there are no surprises when the package arrives.
• Ask about the company's data handling for international customers specifically — as covered in our DNA data privacy guide, where your sample is physically processed and where your data is stored can be governed by different privacy laws than your own country's.
• Confirm collection kit expiration and stability windows if you're not planning to provide your sample immediately upon arrival — this matters more for some collection methods than others.

For more on how your data is handled once your sample is processed, see our DNA data privacy guide.