12 year old child who was diagnosed as a case of dengue on 5 th day of his illness CBC was performed count were as follows Hb, 6.2 RBC,3.4, Hct 22 TLC 2.3, Plat,70. After 36 hours his Hb unexpectedly rises from 6 to 13 Tlc from 2.3 to 4.0 and plat from 70 to 130. Rise of Hb is unexplainable please. Previos CBC was rechecked from 3 different analyzer and the result was found reproducible no change in any parameter