"Neutral" Heartworm Test

Sheltie4

Forums Enthusiast
This was a first for me, but perhaps some of you with more experience have heard of this:

We just got a dog into rescue, who was picked up as a stray.

The first HW test came back as "neutral", neither positive nor negative.

After restesting, it again came back neither positive nor negative . . .

It took a third test, and the vet finally got a negative test result.

Just wondering if any of you have ever heard of this before?
 
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