Laboratory Testing for Iron Vicki S. Freeman, Ph.D., FACB.

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Presentation transcript:

Laboratory Testing for Iron Vicki S. Freeman, Ph.D., FACB

Objectives Discuss the common method of analysis for iron. Discuss the determination of TIBC and the calculation of UIBC and % Saturation.

Total Iron Binding Capacity Fe +3 c c c c c c c c c 1 µmol of transferrin binds 2 µmol of iron c = Transferrin

% Saturation Fe +3 c c c c c c c c c The ratio of serum iron to iron-binding capacity c = Transferrin 9 transferrin molecules = 18 sites 13 Fe molecules = 72% Saturation

Testing for Iron Fe +3 Transferrin transports iron in blood stream (from intestine to cells) Fe +3 acid Fe 3+ + Transferrin Fe3+ + apotransferrin Reducing Agents Fe Fe 2+ Complexing chromogen Fe 2+ + Colored complex Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 Fe +2 c cc c c c Fe +2 Acid Rain removes iron from transferrin protein Alkaline Rain changes ferrous iron to ferric iron Color Change is measured

Total Iron Binding Capacity Fe +3 c c c c c c c c c Add excess iron Bind Fe +3 to free transferrin binding sites Remove Fe +3 left in serum - measure per iron method on previous slide

Unsaturated Iron Binding Capacity Fe +3 Add 17 molecules of iron Bind Fe +3 to free transferrin binding sites Measure Fe +3 left in serum - subtract from original 17 molecules Fe +3 c c c c c c c c c

Questions to think about Iron is transported by _______________. The main storage form of iron is __________. The purpose of hydroxyamine in the iron procedure is to __________Fe +3 to _______. A patient has a serum Fe of 100 mcq/dl and a TIBC of 225 mcq/dl. Calculate the UIBC and % saturation.