I need help with this question please! I am always bad at dilution problems :( A

Question

I need help with this question please! I am always bad at dilution problems :(

A stock solution has a concentration of 500mg/dl. Diluted 0.50ml from this stock with 0.50mL of saline. This solution is injected into a patient. After 30 minutes, the plasma separated from the cells and evaluated for insulin concentration. This specimen produced a result of 50ug/ml. What is the total extra vascular volume for this patient? id="mathjax_msie_frame">> id="mathjax_msie_frame">> please show your work :-) id="mathjax_msie_frame">> I need help with this question please! I am always bad at dilution problems :(

A stock solution has a concentration of 500mg/dl. Diluted 0.50ml from this stock with 0.50mL of saline. This solution is injected into a patient. After 30 minutes, the plasma separated from the cells and evaluated for insulin concentration. This specimen produced a result of 50ug/ml. What is the total extra vascular volume for this patient? id="mathjax_msie_frame"> I need help with this question please! I am always bad at dilution problems :(

A stock solution has a concentration of 500mg/dl. Diluted 0.50ml from this stock with 0.50mL of saline. This solution is injected into a patient. After 30 minutes, the plasma separated from the cells and evaluated for insulin concentration. This specimen produced a result of 50ug/ml. What is the total extra vascular volume for this patient? id="mathjax_msie_frame"> please show your work :-) id="mathjax_msie_frame"> please show your work :-)

Explanation / Answer

conc of stock solution = 500mg/dl = 5mg/ms (1 dl =100ml)

0.5 ml of solution was used. so mass = 0.5* 5mg =2.5mg

conc in specimen was 50ug/ml.

so for mass 2.5mg, volume = 2.5mg/50ug = 2500/50 = 50ml.

so total extra vascular volume =50ml

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