What causes high Phosphate and low BUN?

High Phosphate and low BUN can be caused by many reasons.

If your Phosphate is in between 2.4 mg/dL and 4.5 mg/dL and your BUN is in between 6 mg/dL and 20 mg/dL then you need not worry as these are the normal ranges for Phosphate and BUN 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 Phosphate levels include:

• Kidney failure
• Rickets and osteomalacia (due to vitamin D deficiencies)
• Diabetic ketoacidosis (after treatment)
• Increased blood calcium
• Liver disease

Normal range of Phosphate : 2.4 - 4.5 mg/dL

Ideal values of Phosphate depending on age :

Age	Ideal Phosphate value
<5 years	2.482
5-10 years	2.567
10-15 years	2.655
15-20 years	2.746
20-25 years	2.84
25-30 years	2.937
30-35 years	3.037
35-40 years	3.141
40-45 years	3.248
45-50 years	3.359
50-55 years	3.474
55-60 years	3.592
60-70 years	3.714
70-80 years	3.841
80-90 years	3.972
90-100 years	4.107
>100 years	4.247

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

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.205
5-10 years	6.417
10-15 years	6.636
15-20 years	6.862
20-25 years	7.096
25-30 years	7.338
30-35 years	7.588
35-40 years	7.847
40-45 years	8.115
45-50 years	8.392
50-55 years	8.678
55-60 years	8.974
60-70 years	9.28
70-80 years	9.596
80-90 years	9.923
90-100 years	10.261
>100 years	10.611

High Phosphate and low BUN can be caused by a lot of reasons. If you take Phosphate and BUN blood tests and the results are higher than 4.5 mg/dL for Phosphate and lower than 6 mg/dL for BUN, 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 Phosphate and BUN Tests Are Done :

If your doctor wants Phosphate and BUN tests on you, you may need to go through these tests. During the Phosphate and BUN 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 Phosphate and BUN Test reports by your pathologist.

Medical References

• MedlinePlus – Phosphate in Blood
• WebMD – Phosphate Blood Test: Purpose, High vs. Low vs. Normal Levels
• MedlinePlus – Phosphate in Urine