B cell counts see lymphocyte subsets (B, T, NK cell counts)
B1 see vitamin B1
B2 see vitamin B2
B6 see vitamin B6
Basophils see FBC
Beta amyloid (CSF) see total Tau and A-beta 1-42 (CSF)
Beta crosslaps see CTX
Beta HCG (beta human chorionic gonadotrophin, β-HCG)
Bleeding time - test no longer available.
Blood gases - please use the ward-based blood gas analysers (click here for POCT information).
BNP see NT-proBNP
Borrelia serology see Lyme serology (borreliosis)
Butyrylcholinesterase see cholinesterase (serum)