<prompt> Gaisbocks syndrome refers to:Spurious erythrocytosisSpurious thrombocytosisReactive thrombocytosisReactive erythrocytosis  <response>: Relative Erythrocytosis Hemoconcentration secondary to dehydration, diuretics, ethanol abuse, androgens or tobacco abuse It is Known as stress or spurious erythrocytosis or Gaisbocks syndrome Please NOTE: Not all patients with polycythemia rubra vera exhibit JAK2 mutation. Ref: Harrison, E-18,P-900 