What causes high ESR and low BUN?

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

If your ESR is in between 0.1 mm/hr and 14 mm/hr 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 ESR 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 ESR levels include:

• Rheumatic fever
• Vascular disease
• Autoimmune diseases
• Inflammatory bowel disease
• Heart disease

Normal range of ESR : 0.1 - 14 mm/hr

Ideal values of ESR depending on age :

Age	Ideal ESR value
<5 years	2.021
5-10 years	2.042
10-15 years	2.063
15-20 years	2.084
20-25 years	2.106
25-30 years	2.128
30-35 years	2.15
35-40 years	2.172
40-45 years	2.195
45-50 years	2.218
50-55 years	2.241
55-60 years	2.264
60-70 years	2.288
70-80 years	2.312
80-90 years	2.336
90-100 years	2.36
>100 years	2.385

*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	6.062
5-10 years	6.125
10-15 years	6.189
15-20 years	6.253
20-25 years	6.318
25-30 years	6.384
30-35 years	6.45
35-40 years	6.517
40-45 years	6.585
45-50 years	6.654
50-55 years	6.723
55-60 years	6.793
60-70 years	6.864
70-80 years	6.935
80-90 years	7.007
90-100 years	7.08
>100 years	7.154

High ESR and low BUN can be caused by a lot of reasons. If you take ESR and BUN blood tests and the results are higher than 14 mm/hr for ESR 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 ESR and BUN Tests Are Done :

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

Medical References

• MedlinePlus – Erythrocyte Sedimentation Rate (ESR)
• Cleveland Clinic – Sedimentation Rate (ESR): What It Is & Normal Range
• Mayo Clinic – Sed rate (erythrocyte sedimentation rate)