This is called "overfill" or "dead volume" and most manufacturers account for it by adding slightly more liquid than the labeled amount
1 Stored primarily in the liver, vitamin B12 plays an important role in several essential bodily functions, including: 2 DNA synthesis Healthy red blood cell formation Central nervous system development and function Enzyme function Interest in vitamin B12s role in long-term health has grown in recent years not only because it helps support neuron function, learning, and memory, but also because some research has explored whether elevated vitamin B12 levels may be associated with certain cancers
Injectable folic acid preparations containing benzyl alcohol should be avoided in neonates because benzyl alcohol has been associated with gasping syndrome, a potentially fatal condition characterized by metabolic acidosis and CNS, respiratory, circulatory, and renal dysfunction
While the analogy isn't perfect, it captures the essence of why researchers often prefer localized protocols for joint-specific studies