Is APTT 12 low, normal or dangerous? What does APTT level 12 mean?

📅 Medical Review Date: January 13, 2026

Your APTT level of 12 is a Low APTT level.

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	22.264
5-10 years	22.531
10-15 years	22.801
15-20 years	23.075
20-25 years	23.352
25-30 years	23.632
30-35 years	23.916
35-40 years	24.203
40-45 years	24.493
45-50 years	24.787
50-55 years	25.084
55-60 years	25.385
60-70 years	25.69
70-80 years	25.998
80-90 years	26.31
90-100 years	26.626
>100 years	26.946

*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 low 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	22.272
5-10 years	22.547
10-15 years	22.826
15-20 years	23.108
20-25 years	23.394
25-30 years	23.683
30-35 years	23.976
35-40 years	24.272
40-45 years	24.572
45-50 years	24.876
50-55 years	25.183
55-60 years	25.494
60-70 years	25.809
70-80 years	26.128
80-90 years	26.451
90-100 years	26.778
>100 years	27.109

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