Unsaturated Iron Binding Capacity 
Mnemonic UIBC
CPT 83550†
Test Code 4501055
Synonyms UIBC
Test Includes  
Specimen Serum
Volume 1.0 mL
Container SST or Red Top Tube
Special Instructions Samples should be collected in the morning from patients in a fasting state, iron values can decrease by 30% during the course of the day.
Specimen Prep Centrifuge* For Red Top only, transfer serum to Plastic Transport Tube
Storage Refrigerate
Transport Temp Refrigerated
Stability Rm Temp 4 days
Stability Refrig 1 week
Stability Frozen 1 month
Methodology Nitroso - PSAP
Rejection Criteria   
Reference Value 112 - 347 µg/dL 
Performed/TAT Monday - Sunday        
Comments UIBC is a measure of reserve iron binding capacity of transferrin. Normally, only one-third of the binding sites of transferrin are occupied.