What causes high FT4 thyroid and low Alkaline phosphatase?

High FT4 thyroid and low Alkaline phosphatase can be caused by many reasons.

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your Alkaline phosphatase is in between 30 U/L and 120 U/L then you need not worry as these are the normal ranges for FT4 thyroid and Alkaline phosphatase 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 FT4 thyroid levels include:

• Autoimmune disease
• A non-functioning thyroid gland
• Thyroiditis
• Diabetes
• Liver disease

Normal range of FT4 thyroid : 0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age :

Age	Ideal FT4 thyroid value
<5 years	0.91919
5-10 years	0.94934
10-15 years	0.98048
15-20 years	1.01264
20-25 years	1.04585
25-30 years	1.08015
30-35 years	1.11558
35-40 years	1.15217
40-45 years	1.18996
45-50 years	1.22899
50-55 years	1.2693
55-60 years	1.31093
60-70 years	1.35393
70-80 years	1.39834
80-90 years	1.44421
90-100 years	1.49158
>100 years	1.5405

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

Normal range of Alkaline phosphatase : 30 - 120 U/L

Ideal values of Alkaline phosphatase depending on age :

Age	Ideal Alkaline phosphatase value
<5 years	30.984
5-10 years	32
10-15 years	33.05
15-20 years	34.134
20-25 years	35.254
25-30 years	36.41
30-35 years	37.604
35-40 years	38.837
40-45 years	40.111
45-50 years	41.427
50-55 years	42.786
55-60 years	44.189
60-70 years	45.638
70-80 years	47.135
80-90 years	48.681
90-100 years	50.278
>100 years	51.927

High FT4 thyroid and low Alkaline phosphatase can be caused by a lot of reasons. If you take FT4 thyroid and Alkaline phosphatase blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 30 U/L for Alkaline phosphatase, 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 FT4 thyroid and Alkaline phosphatase Tests Are Done :

If your doctor wants FT4 thyroid and Alkaline phosphatase tests on you, you may need to go through these tests. During the FT4 thyroid and Alkaline phosphatase 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 FT4 thyroid and Alkaline phosphatase Test reports by your pathologist.

Medical References

• MedlinePlus – Thyroxine (T4) Test
• Cleveland Clinic – T4 (Thyroxine) Test: What It Is, Function, Purpose & Levels
• MedlinePlus – Free T4 test
• WebMD – What Is a Thyroxine (T4) Blood Test?
• Mayo Clinic – Hypothyroidism (underactive thyroid) - Diagnosis and treatment