Sickle-cell disease laboratory findings: Difference between revisions

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==Laboratory findings==
==Laboratory findings==
===Blood tests===
===Blood tests===
Complete blood count (CBC) will reveal [[haemoglobin]] levels in the range of 6-8 g/dL with a high [[reticulocyte count]] (greater than 1.5%).
Laboratory findings consistent with the diagnosis of sickle cell disease include:<ref name="pmid1624972">{{cite journal |vauthors=West MS, Wethers D, Smith J, Steinberg M |title=Laboratory profile of sickle cell disease: a cross-sectional analysis. The Cooperative Study of Sickle Cell Disease |journal=J Clin Epidemiol |volume=45 |issue=8 |pages=893–909 |date=August 1992 |pmid=1624972 |doi= |url=}}</ref><ref name="pmid16549581">{{cite journal |vauthors=Bernard AW, Venkat A, Lyons MS |title=Best evidence topic report. Full blood count and reticulocyte count in painful sickle crisis |journal=Emerg Med J |volume=23 |issue=4 |pages=302–3 |date=April 2006 |pmid=16549581 |pmc=2579511 |doi=10.1136/emj.2006.035154 |url=}}</ref>
On a peripheral blood film, one can observe features of [[hyposplenism]] i.e., target cells and Howell-Jolly bodies.
**Anemia
Sickling of the red blood cells, on a blood film, can be induced by the addition of sodium metabisulphite.
**High [[reticulocyte count]] (greater than 1.5%)
Another test is Sickle Solubility Test. A mixture of haemoglobin S (Hb S) in a reducing solution e.g., sodium dithionite gives a turbid appearance while normal Hb gives a clear solution.
**Target cells and Howell-Jolly bodies on pripheral blood smear
Abnormal [[hemoglobin]] forms can be detected on [[hemoglobin electrophoresis]], a form of [[gel electrophoresis]] on which the various types of hemoglobin move at varying speed. Sickle-cell hemoglobin (HgbS) and [[hemoglobin C]] with sickling (HgbSC) are the two most common forms and are identifiable. [[Genetic testing]] is rarely performed.
**Abnormal [[hemoglobin]] forms on [[hemoglobin electrophoresis]] (Sickle-cell hemoglobin (HgbS) and [[hemoglobin C]] with sickling (HgbSC) are the two most common forms)
 
For patients with sickle cell disease who present with possible infection, important laboratory testing may include: urinalysis, blood cultures, sputum cultures, and cerebrospinal fluid analysis.


==References==
==References==

Revision as of 16:09, 1 August 2018

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aarti Narayan, M.B.B.S [2], Shyam Patel [3]

Overview

The most important laboratory test for sickle cell anemia is a complete blood count (CBC), specifically hemoglobin and hematocrit.

Laboratory findings

Blood tests

Laboratory findings consistent with the diagnosis of sickle cell disease include:[1][2]

References

  1. West MS, Wethers D, Smith J, Steinberg M (August 1992). "Laboratory profile of sickle cell disease: a cross-sectional analysis. The Cooperative Study of Sickle Cell Disease". J Clin Epidemiol. 45 (8): 893–909. PMID 1624972.
  2. Bernard AW, Venkat A, Lyons MS (April 2006). "Best evidence topic report. Full blood count and reticulocyte count in painful sickle crisis". Emerg Med J. 23 (4): 302–3. doi:10.1136/emj.2006.035154. PMC 2579511. PMID 16549581.

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