question: Hi   My son 7 yrs old(fever in nov end throat pain)has thalessemia trait,received blood transfusion on 8-12 & 10-12-11 due to sudden hb drop to 6.8 ,tlc-4600,n-585,plates-306000,RETIC count-3%,M-56 RBC-4.56,RWD-15.6,S-IRON-18,TIBC-280,Iron Saturation-6.4. once again after one month of blood transfusion CBC DONE .LFT-OK,LDH 862 FERRITIN 297,cal & phos Ca;9.3 phos 3.5 .what was the cause of sudden hb drop? and FERRITINlevel 297 indicates what?Is there any threat?