Study points to EDTA as better option for canine marrow processing
A new Veterinary Pathology study suggests that how canine bone marrow samples are processed before staining can materially affect what pathologists are able to see and test. In paired sternal bone marrow samples collected from dogs within 24 hours of death, researchers compared two fixatives, acetic acid-zinc-formalin and 10% neutral-buffered formalin, plus three demineralization methods: hydrochloric acid, formic acid, and EDTA. They found no significant morphology difference between the two fixatives, but EDTA demineralization produced the best tissue preservation, outperforming formic acid and hydrochloric acid. The same research group had also reported that EDTA markedly improved downstream DNA amplification in canine bone marrow, while acid-based methods performed poorly, adding weight to the case for slower, gentler processing when additional testing may be needed. Related work outside clinical pathology also underscores the point that mineralized tissues can still support strong molecular testing when handled carefully: a recent Animals paper described a simple EDTA-based digestion and organic extraction protocol that generated complete microsatellite genotypes from all 60 deer antler and prepared trophy skull samples tested, without commercial kits or cryogenic grinding. (pubmed.ncbi.nlm.nih.gov)
Why it matters: For veterinary professionals, especially pathologists and diagnostic labs, the study reinforces that pre-analytic handling is not just a technical detail. Bone marrow cores are often used for histopathology, immunohistochemistry, and sometimes molecular follow-up such as PARR, and acid decalcification can compromise antigenicity, tissue architecture, and nucleic acid quality. If EDTA-based protocols preserve more reliable staining and morphology, labs may need to weigh longer turnaround times against better diagnostic confidence, particularly in cases involving hematopoietic neoplasia or infectious disease workups. The deer antler and trophy-skull study adds a useful broader reminder that even heavily mineralized or processed tissues can yield high-quality DNA for genotyping when gentler EDTA-based approaches are used. (pmc.ncbi.nlm.nih.gov)
What to watch: Whether veterinary diagnostic laboratories revise standard bone marrow decalcification protocols toward EDTA, especially for cases likely to need immunohistochemistry or molecular testing, and whether similar extraction-minded approaches from other mineralized tissues help inform future veterinary lab workflows. (pmc.ncbi.nlm.nih.gov)