What causes high INR and low RBC?

High INR and low RBC can be caused by many reasons.

If your INR is in between 0.9 ratio and 1.2 ratio and your RBC is in between 4.5 mil/uL and 5.5 mil/uL then you need not worry as these are the normal ranges for INR and RBC 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 INR levels include:

• Liver disease
• Vitamin K abnormality
• Decreased or defective factor I (fibrinogen), II (prothrombin), V or X
• Hemophilia A and hemophilia B
• Autoantibody against a specific factor (e.g., factor VIII)

Normal range of INR : 0.9 - 1.2 ratio

Ideal values of INR depending on age :

Age	Ideal INR value
<5 years	0.945
5-10 years	0.992
10-15 years	1.042
15-20 years	1.094
20-25 years	1.149
25-30 years	1.147
30-35 years	1.144
35-40 years	1.141
40-45 years	1.198
45-50 years	1.195
50-55 years	1.192
55-60 years	1.189
60-70 years	1.186
70-80 years	1.183
80-90 years	1.18
90-100 years	1.177
>100 years	1.174

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

Normal range of RBC : 4.5 - 5.5 mil/uL

Ideal values of RBC depending on age :

Age	Ideal RBC value
<5 years	4.725
5-10 years	4.962
10-15 years	5.211
15-20 years	5.472
20-25 years	5.458
25-30 years	5.444
30-35 years	5.431
35-40 years	5.417
40-45 years	5.403
45-50 years	5.39
50-55 years	5.376
55-60 years	5.362
60-70 years	5.349
70-80 years	5.336
80-90 years	5.322
90-100 years	5.309
>100 years	5.296

High INR and low RBC can be caused by a lot of reasons. If you take INR and RBC blood tests and the results are higher than 1.2 ratio for INR and lower than 4.5 mil/uL for RBC, 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 INR and RBC Tests Are Done :

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

Medical References

• MedlinePlus – Prothrombin Time Test and INR (PT/INR)
• Mayo Clinic – Prothrombin time test
• Cleveland Clinic – Prothrombin Time (PT/INR) Test