Is APTT 40.5 high, normal or dangerous? What does APTT level 40.5 mean?

📅 Medical Review Date: March 5, 2026

Your APTT level of 40.5 is a High APTT level.

High 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	22.891
5-10 years	23.818
10-15 years	24.783
15-20 years	25.787
20-25 years	26.831
25-30 years	27.918
30-35 years	29.049
35-40 years	30.225
40-45 years	31.449
45-50 years	32.723
50-55 years	34.048
55-60 years	33.992
60-70 years	33.937
70-80 years	33.881
80-90 years	33.825
90-100 years	33.77
>100 years	33.715

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

Get Advice via Email : Send us your blood test report, and our APTT experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides APTT, please include those too—an accurate diagnosis often requires a full view of all abnormalities. 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

Receive world-class medical opinion about your high APTT levels over email.Upload blood test report now

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

Ideal values of APTT depending on age (female) :

Age	Ideal APTT value
<5 years	22.918
5-10 years	23.874
10-15 years	24.87
15-20 years	25.907
20-25 years	26.988
25-30 years	28.114
30-35 years	29.287
35-40 years	30.509
40-45 years	31.782
45-50 years	33.108
50-55 years	34.489
55-60 years	34.429
60-70 years	34.369
70-80 years	34.309
80-90 years	34.249
90-100 years	34.19
>100 years	34.13

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