Hello, I'm a new guy and am glad to have found this site. I have a question which perhaps I ought to post to a more proper forum; but until I figure this out, I will ask it here. In what percentage of cases is an AST postive after standard Rhogam injection? On average, what is the longevity of a measurable AST at whatever titre for anti-D after injection. IgG half-life is about three weeks, but over what time interval are our tests sufficiently sensitive to pick up a titer? I would assume all answers would be tempered by the presence of MFH of varying severity which might account for loss of the passive anti-D in the serum. And, lastly, is anyone really looking at the AST to help determine if additional Rhogam is necessary (in an antepartum bleed situation, i.e., within three days of the initial injection to see if another injection is called for)? Nothing like a succinct question on my first foray, huh?