K.G.
I'm guessing that you're asking about alcohol content in breast milk. Right? My husband and I came up with a simple method for figuring out if it was okay for our littles: it takes one hour to metabolize one drink. So if my little one ate at 5 pm, and the next feeding is at about 8 pm, then I could have two drinks (or three drinks, but I'm kind of a lightweight) and the baby would be fine.
I found that the screening strips either told me that the breast milk was always bad or always good, depending on the strips. There didn't seem to be any rhyme or reason to it. Just my experience.