In the dog heartworm test procedure, after how many seconds does the sample reach the activation circle?

In the dog heartworm test procedure, after how many seconds does the sample reach the activation circle?

• A. 10-20 seconds
• B. 5-7 minutes
• C. 30-60 seconds
• D. 2-3 minutes

Answer: (C)

In a quick dog heartworm test, the sample moves by capillary action from the application area to the activation circle, where the test begins to run. The device is designed so this migration takes about 30 to 60 seconds. That time window balances giving enough sample enough opportunity to reach and interact with the reagents on the activation circle without drying out the membrane or causing inconsistent flow. If it happens much faster, there may not be proper contact with the conjugate; if it takes too long, drying or uneven flow can affect accuracy. So the 30–60 second range is the practical middle ground that supports reliable results.

In a quick dog heartworm test, the sample moves by capillary action from the application area to the activation circle, where the test begins to run. The device is designed so this migration takes about 30 to 60 seconds. That time window balances giving enough sample enough opportunity to reach and interact with the reagents on the activation circle without drying out the membrane or causing inconsistent flow. If it happens much faster, there may not be proper contact with the conjugate; if it takes too long, drying or uneven flow can affect accuracy. So the 30–60 second range is the practical middle ground that supports reliable results.