Is APTT 10.4 low, normal or dangerous? What does APTT level 10.4 mean?

📅 Medical Review Date: April 18, 2026

Your APTT level of 10.4 is a Low APTT level.

An APTT level of 10.4 seconds usually means blood clots faster than normal. It suggests increased clotting risk. Low levels of APTT can cause blood clots in legs, chest pain, shortness of breath, swelling in limbs, and increased risk of stroke or heart attack. This can be caused by certain cancers, factor V Leiden mutation, or inflammatory conditions. Further tests are often needed to identify the cause and guide appropriate treatment.

Low APTT levels may indicate underlying health problems. The normal range is typically between 22 seconds and 35 seconds. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal APTT range for men is :22 - 35 seconds

Ideal values of APTT depending on age (male) :

Age	Ideal APTT value
<5 years	22.229
5-10 years	22.46
10-15 years	22.694
15-20 years	22.93
20-25 years	23.168
25-30 years	23.409
30-35 years	23.652
35-40 years	23.898
40-45 years	24.147
45-50 years	24.398
50-55 years	24.652
55-60 years	24.908
60-70 years	25.167
70-80 years	25.429
80-90 years	25.693
90-100 years	25.96
>100 years	26.23

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

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

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

Normal range of APTT found among women :22-35 seconds

Ideal values of APTT depending on age (female) :

Age	Ideal APTT value
<5 years	22.236
5-10 years	22.474
10-15 years	22.715
15-20 years	22.958
20-25 years	23.204
25-30 years	23.453
30-35 years	23.704
35-40 years	23.958
40-45 years	24.215
45-50 years	24.474
50-55 years	24.736
55-60 years	25.001
60-70 years	25.269
70-80 years	25.54
80-90 years	25.814
90-100 years	26.091
>100 years	26.37

If you take a APTT blood test and the results are not in the normal range (22-35 seconds), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the APTT Test Is Done :

When your doctor orders a APTT test, it involves a straightforward blood draw to measure your APTT levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your APTT test results are usually available within a few hours.

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