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Author Question: A patient with a small number of spherocytes, increased reticulocytes, and increased MCHC has a ... (Read 59 times)

lidoalex

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on: Jun 25, 2018
A patient with a small number of spherocytes, increased reticulocytes, and increased MCHC has a normal osmotic fragility. Select the best course of action.
 
  a. Dismiss the spherocytes as an artifact.
  b. Repeat the osmotic fragility after incubating the blood at 37 C for 24 hours.
  c. Check the cell counter for errors in the MCHC.
  d. Collect a new blood sample.

Question 2

A patient with a previously compensated hereditary spherocytosis has a severe drop in hemoglobin after a parvovirus infection. This represents what type of crisis?
 
  a. Megaloblastic
  b. Hemolytic
  c. Aplastic
  d. Anemic


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bbburns21

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Incubating the blood at 37 C for 24 hours can increase the sensitivity of the osmotic fragility so that a previously normal result becomes abnormal. During this incubation period, red cells become metabolically deprived and tend to lose membrane surface because of their relative membrane instability.

Answer to Question 2

ANS: C
After some viral infections, particularly with parvovirus B19 that invades developing red cells and inhibits their growth, a severe drop in hemoglobin can occur. This is termed an aplastic crisis.


lidoalex

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Reply 2 on: Jun 25, 2018
Excellent

ttt030911

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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