According to the concept of your question which I understand, you argued about engagement of the platelets in calculating the blood cell count (hematocrit). It's noticeable that in general blood examinations which held in clinical laboratories, accuracy of results are not as precise as what held in researching laboratories because it's aimed to report some general information to patients. Therefore, in such cases they ignore platelet numbers in blood count because they are too small to recognition. But in research aimed experiments, accuracy of devices is high which can consider nano molecules. In general, ordinary devices just count red blood cells (R.B.C) and report it as hematocrit without even considering white blood cells. In addition, each laboratory results could be different for same specimen, just because of the device maker values and it's better to try with same laboratories to compare results.

Attar M. K. A.

Dear Mojtaba, 

Thanks! You may have misunderstood my question. I did refer to the platelets in the PCV. I meant to say, when there is hemoconcentration, any concentration parameter should increase (since the volume of the solvent is decreasing). This is best shown by the rise in hematocrit value in hemoconcentration. What I ask is, if there is worsening of symptoms in dengue, the hematocrit rises. So how can we compare two concentration parameters (like platelet count, WBC count) at two different time points when not just the solute but also the solvent is at loss. 

Actually we cannot compare in strict sense. However, according to newer management protocols, platelet count and leukopenia is on only important in the clinical diagnosis of dengue. Platelet transfusions are no longer a method of treatment. The severity does not depend on above factors. Severity is defined by the severity of the leakage (hematocrit), liver failure and by atypical presentations like myocarditis.