How to know 100% if you have bed bugs?

To know 100 percent if you have bed bugs, you need to find live bed bugs, their eggs, or definitive signs confirmed by professional inspection, because bites alone are not definitive as they resemble mosquito and flea bites and some people do not react. The only way to be 100 percent sure is to find live bed bugs themselves, which are small, flat, oval, reddish-brown insects about apple seed size that do not jump or fly, hiding during day in mattress seams, box spring cracks, headboard crevices, behind baseboards, and in furniture joints within 5 to 8 feet of bed. Use thorough inspection with flashlight at night between 2 AM and 5 AM when they are most active, inspecting mattress seams, piping, tags, box spring edges and staples, headboard screw holes, and nightstand joints. Look for corroborating signs such as tiny white eggs about 1 mm in clusters in cracks, translucent shed skins from molting nymphs, dark fecal spots that look like ink dots on mattress seams and walls that smear when wet, and rust-colored stains on sheets from crushed engorged bugs. Use interceptor traps under bed legs overnight to catch bugs crawling, and place double sided tape. For 100 percent confirmation, collect suspected bugs in sealed bag and have pest control professional or entomologist identify under microscope, as bat bugs and other lookalikes are nearly identical. Professional inspection with canine detection can also confirm.