What causes high RDW SD and low FT3 thyroid?

High RDW SD and low FT3 thyroid can be caused by many reasons.

If your RDW SD is in between 39 fL and 46 fL and your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL then you need not worry as these are the normal ranges for RDW SD and FT3 thyroid respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Normal range of RDW SD : 39 - 46 fL

Ideal values of RDW SD depending on age :

Age	Ideal RDW SD value
<5 years	39.682
5-10 years	40.376
10-15 years	41.082
15-20 years	41.801
20-25 years	42.532
25-30 years	43.276
30-35 years	44.033
35-40 years	44.803
40-45 years	45.587
45-50 years	45.573
50-55 years	45.559
55-60 years	45.545
60-70 years	45.531
70-80 years	45.517
80-90 years	45.503
90-100 years	45.489
>100 years	45.475

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

If you want your blood test report to be interpreted by RDW SD specialist, then you can upload your report. Our RDW SD expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

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Some examples of conditions that 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

If you want your blood test report to be interpreted by RDW SD specialist, you can upload your report. Our RDW SD expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

Normal range of FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :

Age	Ideal FT3 thyroid value
<5 years	2.34
5-10 years	2.381
10-15 years	2.423
15-20 years	2.465
20-25 years	2.508
25-30 years	2.552
30-35 years	2.597
35-40 years	2.642
40-45 years	2.688
45-50 years	2.735
50-55 years	2.783
55-60 years	2.832
60-70 years	2.882
70-80 years	2.932
80-90 years	2.983
90-100 years	3.035
>100 years	3.088

High RDW SD and low FT3 thyroid can be caused by a lot of reasons. If you take RDW SD and FT3 thyroid blood tests and the results are higher than 46 fL for RDW SD and lower than 2.3 pg/mL for FT3 thyroid, 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 FT3 thyroid Tests Are Done :

If your doctor wants RDW SD and FT3 thyroid tests on you, you may need to go through these tests. During the RDW SD and FT3 thyroid 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 FT3 thyroid Test reports by your pathologist.