Is APTT 42.1 high, normal or dangerous? What does APTT level 42.1 mean?

📅 Medical Review Date: March 16, 2026

Your APTT level of 42.1 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	22.926
5-10 years	23.891
10-15 years	24.897
15-20 years	25.945
20-25 years	27.037
25-30 years	28.175
30-35 years	29.361
35-40 years	30.597
40-45 years	31.885
45-50 years	33.227
50-55 years	34.626
55-60 years	34.565
60-70 years	34.504
70-80 years	34.443
80-90 years	34.382
90-100 years	34.321
>100 years	34.26

*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	22.954
5-10 years	23.949
10-15 years	24.988
15-20 years	26.072
20-25 years	27.203
25-30 years	28.383
30-35 years	29.614
35-40 years	30.898
40-45 years	32.238
45-50 years	33.636
50-55 years	33.573
55-60 years	33.51
60-70 years	34.963
70-80 years	34.897
80-90 years	34.831
90-100 years	34.765
>100 years	34.7

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