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!align="left" bgcolor="#F2F2F2"|ACTH
 
!align="left" bgcolor="#F2F2F2"|ACTH
 
|bgcolor="#F2F2F2"|EDTA plasma
 
|bgcolor="#F2F2F2"|EDTA plasma
|bgcolor="#F2F2F2"| Freeze plasma as soon after collection as poss (max 2 hours)
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|}ould terminate before the end of the slide (Fig 1).  
|-
  −
!align="left" bgcolor="#F2F2F2"|Selenium
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|bgcolor="#F2F2F2"|Heparin/Serum
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|bgcolor="#F2F2F2"|Send Heparin for deficiency testing, serum for toxicity testing.
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|-
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!align="left"|Zinc
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|Serum
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|Avoid using tubes with a rubber bung
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|-
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!align="left" bgcolor="#F2F2F2"|Drugs testing
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|bgcolor="#F2F2F2"|Serum o
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|}the slide, when cells can be lost overthe edges. The smear should terminate before the end of the slide (Fig 1).  
      
The area to be examined is the monolayer where 50% or less of cells are in contact.
 
The area to be examined is the monolayer where 50% or less of cells are in contact.