Q:

All the following are helpful for diagnosis of marginal vitamin A deficiency EXCEPT

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All the following are helpful for diagnosis of marginal vitamin A deficiency EXCEPT


  1. dark adaptation test
  2. conjunctival impression cytology
  3. relative dose response
  4. plasma retinol level
  5. diet histor

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(D). The plasma retinol level is not an accurate indicator of vitamin A status unless the deficiency is severe and liver stores are depleted, in which case low plasma retinol is likely to be evident

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