Total iron-binding capacity

(Redirected from TIBC)
Jump to navigation Jump to search

WikiDoc Resources for Total iron-binding capacity

Articles

Most recent articles on Total iron-binding capacity

Most cited articles on Total iron-binding capacity

Review articles on Total iron-binding capacity

Articles on Total iron-binding capacity in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Total iron-binding capacity

Images of Total iron-binding capacity

Photos of Total iron-binding capacity

Podcasts & MP3s on Total iron-binding capacity

Videos on Total iron-binding capacity

Evidence Based Medicine

Cochrane Collaboration on Total iron-binding capacity

Bandolier on Total iron-binding capacity

TRIP on Total iron-binding capacity

Clinical Trials

Ongoing Trials on Total iron-binding capacity at Clinical Trials.gov

Trial results on Total iron-binding capacity

Clinical Trials on Total iron-binding capacity at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Total iron-binding capacity

NICE Guidance on Total iron-binding capacity

NHS PRODIGY Guidance

FDA on Total iron-binding capacity

CDC on Total iron-binding capacity

Books

Books on Total iron-binding capacity

News

Total iron-binding capacity in the news

Be alerted to news on Total iron-binding capacity

News trends on Total iron-binding capacity

Commentary

Blogs on Total iron-binding capacity

Definitions

Definitions of Total iron-binding capacity

Patient Resources / Community

Patient resources on Total iron-binding capacity

Discussion groups on Total iron-binding capacity

Patient Handouts on Total iron-binding capacity

Directions to Hospitals Treating Total iron-binding capacity

Risk calculators and risk factors for Total iron-binding capacity

Healthcare Provider Resources

Symptoms of Total iron-binding capacity

Causes & Risk Factors for Total iron-binding capacity

Diagnostic studies for Total iron-binding capacity

Treatment of Total iron-binding capacity

Continuing Medical Education (CME)

CME Programs on Total iron-binding capacity

International

Total iron-binding capacity en Espanol

Total iron-binding capacity en Francais

Business

Total iron-binding capacity in the Marketplace

Patents on Total iron-binding capacity

Experimental / Informatics

List of terms related to Total iron-binding capacity

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Total iron-binding capacity is a medical laboratory test. The test measures the extent to which iron-binding sites in the serum can be saturated. Because the iron-binding sites in the serum are almost entirely dependent on circulating transferrin, this is really an indirect measurement of the amount of transferrin in the blood.

Taken together with serum iron and percent transferrin saturation clinicians usually perform this test when they are concerned about anemia, iron deficiency or iron deficiency anemia. However, because the liver produces transferrin, liver function must be considered when performing this test. It can also be an indirect test of liver function, but is rarely used for this purpose.

The liver produces more transferrin in response to iron deficiency, so the percent transferrin saturation (i.e., the result of the formula of serum iron/TIBC x 100) can also be a useful indicator.

In simple iron deficiency anemia, the serum iron is low, the transferrin is high, and therefore the percent transferrin saturation is very low.

On the other hand, in anemia of chronic disease, the body holds iron out of the serum but also produces less transferrin (presumably as part of a response to keep iron away from pathogens that require it for their metabolism). In this case, serum iron is low but the TIBC (that is, the transferrin) is low. So the percent transferrin saturation is normal.

In women who are pregnant or are using hormonal contraception, the liver increases the production of transferrin. This produces a higher TIBC and a lower percent transferrin saturation even with normal iron.

These examples demonstrate that to properly understand a value for TIBC, one also must know the serum iron, the percent transferrin saturation, and the individual clinical situation.

To do the test, labs use serum from blood drawn from a vein.

Usual values

  • Serum iron: Male 65-177 μg/dL (11.6-31.3 μmol/L)
  • Serum iron: Female 50-170 μg/dL (9.0-30.4 μmol/L)
  • TIBC: 240-450 mg/dL (44.8-71.6 μmol/L)
  • Transferrin saturation: Male 20-50%
  • Transferrin saturation: Female 15-50%

μg/dL = micrograms per deciliter; μmol/L = micromoles per litre.

Laboratories often use different units and "normal" may vary by population and the lab techniques used. Look at the individual laboratory reference values to interpret a specific test (for instance, your own).

References

  • Medline Plus Medical Encyclopedia: TIBC.
  • Schrier SL. Regulation of iron balance. Up-to-Date. Accessed December 5, 2005. (Requires subscription.)

Template:Hematology


Template:WikiDoc Sources