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Which of the following analytes has a very narrow therapeutic range and has high toxicity if it is above it?

A patient brought to the emergency room has the following laboratory results: sodium = 140 mmol/L BUN = 6.0 mg/dL glucose = 80 mg/dL osmolality = 316 mOsm/Kg H2O   The calculated osmolality on this patient using the Weisberg formula is:  

A lab tech was running several lipid profiles. She notices that one of the samples was 4+ (on the scale 1-4) lipemic.  What is causing the visible lipemia?  

Bonus 2: What is an important finding on the blood smear of the child with lead poisoning?

A hemolyzed sample will cause falsely elevated levels of each of the following EXCEPT:

Which of the following does not have an effect on serum calcium levels?  

Which plasma electrolyte has the most narrow reference range and is MOST strictly regulated by the body:

11. Which of the following are considered primary tissue sources of alkaline phosphatase?     

If the measured osmolality = 316 mOsm/Kg H2O and calculated osmolality is the answer from previous question, Is the osmolal gap is:

29. Which of the following cardiac markers remains elevated the longest after a myocardial infarction?