What causes high RDW SD and low TIBC?

High RDW SD and low TIBC can be caused by many reasons.

If your RDW SD is in between 39 fL and 46 fL and your TIBC is in between 250 mcg/dL and 450 mcg/dL then you need not worry as these are the normal ranges for RDW SD and TIBC respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can increase or decrease RDW SD levels include:

• Thalassemia, an inherited blood disorder
• Crohn's disease
• Chronic liver disease
• An iron or vitamin deficiency
• Heart disease

RDW SD treatment - Click to read 10 GOLDEN ARTICLES on Anemia

Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.691
5-10 years	40.394
10-15 years	41.109
15-20 years	41.837
20-25 years	42.578
25-30 years	43.332
30-35 years	44.099
35-40 years	44.88
40-45 years	45.675
45-50 years	45.661
50-55 years	45.647
55-60 years	45.632
60-70 years	45.618
70-80 years	45.604
80-90 years	45.59
90-100 years	45.575
>100 years	45.561

*Ideal values are calculated based on our database of patient records

Normal range of TIBC : 250 - 450 mcg/dL

Ideal values of TIBC depending on age :

Age	Ideal TIBC value
<5 years	254.428
5-10 years	258.934
10-15 years	263.52
15-20 years	268.187
20-25 years	272.937
25-30 years	277.771
30-35 years	282.69
35-40 years	287.696
40-45 years	292.791
45-50 years	297.976
50-55 years	303.253
55-60 years	308.624
60-70 years	314.09
70-80 years	319.653
80-90 years	325.314
90-100 years	331.075
>100 years	336.938

High RDW SD and low TIBC can be caused by a lot of reasons. If you take RDW SD and TIBC blood tests and the results are higher than 46 fL for RDW SD and lower than 250 mcg/dL for TIBC, your physician may recommend more tests to figure out the problem. You might also get these tests if your physician thinks you have some other disease.

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How the RDW SD and TIBC Tests Are Done :

If your doctor wants RDW SD and TIBC tests on you, you may need to go through these tests. During the RDW SD and TIBC blood tests, a pathologist will put a needle into your veins and take out a small quantity of blood. A pathologist is a physician in the medical field who thoroughly studies the causes and effects of disease. Within a few hours you will get your RDW SD and TIBC Test reports by your pathologist.

Medical References

• MedlinePlus – RDW (Red Cell Distribution Width)
• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• NIH – RDW-SD is Superior to RDW-CV in Reflecting Liver Fibrosis Stage in Patients with Chronic Hepatitis B