Meaning bone marrow tests or MRIs or things like that. (kidsinthehouse.com)
There are special, rather complicated bone marrow tests that help diagnose the feline leukemia virus (FeLV), but these are not routinely done. (1800petmeds.com)
Andrea's presentation featured Sammie Fallon who died of MRSA aged just 17 after having a bone marrow test. (politics.co.uk)