What causes high APTT and low MCHC?

High APTT and low MCHC can be caused by many reasons.

If your APTT is in between 22 seconds and 35 seconds and your MCHC is in between 31.5 g/dL and 34.5 g/dL then you need not worry as these are the normal ranges for APTT and MCHC 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 APTT : 22 - 35 seconds

Ideal values of APTT depending on age :

Age	Ideal APTT value
<5 years	22.376
5-10 years	22.758
10-15 years	23.146
15-20 years	23.541
20-25 years	23.943
25-30 years	24.352
30-35 years	24.768
35-40 years	25.191
40-45 years	25.621
45-50 years	26.058
50-55 years	26.503
55-60 years	26.955
60-70 years	27.415
70-80 years	27.883
80-90 years	28.359
90-100 years	28.843
>100 years	29.335

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

If you want your blood test report to be interpreted by APTT specialist, then you can upload your report. Our APTT 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 APTT levels include:

• Liver disease
• Vitamin K abnormality
• Decreased or defective factor I (fibrinogen), II (prothrombin), V or X
• Hemophilia A and hemophilia B
• Willebrand disease

If you want your blood test report to be interpreted by APTT specialist, you can upload your report. Our APTT 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 MCHC : 31.5 - 34.5 g/dL

Ideal values of MCHC depending on age :

Age	Ideal MCHC value
<5 years	32.038
5-10 years	32.585
10-15 years	33.141
15-20 years	33.707
20-25 years	34.282
25-30 years	34.272
30-35 years	34.262
35-40 years	34.252
40-45 years	34.242
45-50 years	34.233
50-55 years	34.223
55-60 years	34.213
60-70 years	34.203
70-80 years	34.193
80-90 years	34.183
90-100 years	34.174
>100 years	34.164

High APTT and low MCHC can be caused by a lot of reasons. If you take APTT and MCHC blood tests and the results are higher than 35 seconds for APTT and lower than 31.5 g/dL for MCHC, 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 APTT and MCHC Tests Are Done :

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

Medical References

• WebMD – Activated Partial Thromboplastin Time (APTT) Test
• Cleveland Clinic – Partial Thromboplastin Time (PTT) Test
• NIH – Solutions to Establishing and Verifying Normal Reference Intervals and Assessing APTT Reagents