I would take offense to being considered "only" a C, H, BB, etc. (and admit I'm a completely biased BB(ASCP)). A tech with a categorical certification is a Technologist, and I'll wager the blood bank-related questions on my BB exam were much more difficult than the blood bank questions on the MT exam. There are additional work experience requirements one has to fulfill to obtain a BB certification beyond that required for an MT (now MLS) certification (see http://www.ascp.org/FunctionalNavigation/certification/GetCertified/TechnologistCertification.aspx), so I don't understand any justification for paying someone with a BB less. It's a lot more work to get one, so if anything they should be paid a premium. A tech with a categorical certification has demonstrated specialized knowledge in a subject area, while a generalist MT has demonstrated generalist knowledge. A tech with a categorical certification should be expected to function at a higher level in their area of specialty than a generalist MT, that's the intent of categorical certifications. I don't think the regulators at the ASCP thought them up so that mentally deficient techs that can only remain competent in one area have a chance to work, too (I don't mean that with the mean spirited tone it's carrying, I just can't think of a more effective way to phrase it). Anyway, bottom line is, your HR department is wrong, the BB certification is not an "add-on" and it's not equivalent to a Technician certification, and if they don't value the specialized knowledge you've demonstrated you have then there are plenty of organizations that will. I see adverts all the time for blood bank techs preferring the BB certification over the MT. Many supervisor positions now advertise "SBB or BB preferred." Incidentally, you're a Technologist now, so you should drop the MLT from your credentials. You're a BB(ASCP)^CM, say it loud and say it proud. Peace, JD