The Snap Canine Heartworm Test detects what in blood?

The Snap Canine Heartworm Test detects what in blood?

• A. Microfilaria
• B. Adult heartworms
• C. Antigen produced by female heartworms
• D. Female heartworms only

Answer: (C)

This test works by identifying circulating antigen produced by adult female heartworms, so a positive result specifically indicates the presence of at least one adult female worm in the dog’s body. The antigen is not the same as microfilariae; microfilariae are the larval offspring that can circulate in blood, but they aren’t what this test detects. Because it relies on female-worm antigen, infections with only male worms may not be detected, and very early infections may be negative until female worms have matured enough to release detectable antigen. In practice, a positive antigen test confirms adult female heartworms are present, which is why it’s a key diagnostic tool, while separate tests are used to detect microfilariae if that information is needed.

This test works by identifying circulating antigen produced by adult female heartworms, so a positive result specifically indicates the presence of at least one adult female worm in the dog’s body. The antigen is not the same as microfilariae; microfilariae are the larval offspring that can circulate in blood, but they aren’t what this test detects. Because it relies on female-worm antigen, infections with only male worms may not be detected, and very early infections may be negative until female worms have matured enough to release detectable antigen. In practice, a positive antigen test confirms adult female heartworms are present, which is why it’s a key diagnostic tool, while separate tests are used to detect microfilariae if that information is needed.