What causes high RDW SD and low Bilirubin direct?

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

If your RDW SD is in between 39 fL and 46 fL and your Bilirubin direct is in between 0.1 mg/dL and 0.2 mg/dL then you need not worry as these are the normal ranges for RDW SD and Bilirubin direct 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	39.671
5-10 years	40.353
10-15 years	41.047
15-20 years	41.753
20-25 years	42.471
25-30 years	43.202
30-35 years	43.945
35-40 years	44.701
40-45 years	45.47
45-50 years	45.456
50-55 years	45.443
55-60 years	45.43
60-70 years	45.416
70-80 years	45.402
80-90 years	45.389
90-100 years	45.376
>100 years	45.362

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

Normal range of Bilirubin direct : 0.1 - 0.2 mg/dL

Ideal values of Bilirubin direct depending on age :

Age	Ideal Bilirubin direct value
<5 years	0.11189
5-10 years	0.11381
10-15 years	0.11577
15-20 years	0.11776
20-25 years	0.11979
25-30 years	0.12185
30-35 years	0.12395
35-40 years	0.12608
40-45 years	0.12825
45-50 years	0.13046
50-55 years	0.1327
55-60 years	0.13498
60-70 years	0.1373
70-80 years	0.13966
80-90 years	0.14206
90-100 years	0.1445
>100 years	0.14699

High RDW SD and low Bilirubin direct can be caused by a lot of reasons. If you take RDW SD and Bilirubin direct blood tests and the results are higher than 46 fL for RDW SD and lower than 0.1 mg/dL for Bilirubin direct, 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 Bilirubin direct Tests Are Done :

If your doctor wants RDW SD and Bilirubin direct tests on you, you may need to go through these tests. During the RDW SD and Bilirubin direct 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 Bilirubin direct 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