What is the osmolarity of D 5?
                                
                                
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                                    4 min read                                
                            
                                While the labeled, calculated osmolarity of D 5 is 252–278 mOsm/L, this solution acts differently inside the body. The crucial question of what is the osmolarity of D 5 is more complex than a single number suggests, requiring an understanding of both initial properties and post-metabolism effects.