: APTT in the blood is completely missing If in the blood, according to the blood tests, the APTT is 233 (norm is 150), does it mean that there was an error during the test, or it may actually be true?

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The Activated Partial Thromboplastin Time is a test measuring clotting factors, not a level of clotting factors in your blood. It is most often used to monitor the effects of heparin therapy (an anticoagulant.)

Because different labs use different tests, the "normal" results may vary. The results are reported in seconds; for example the Mayo Clinic reports

the therapeutic APTT range to be approximately 70 to 120 seconds.

There is a limit for how long the reaction will be observed (if the blood doesn't clot in a reasonable amount of time, people need to report that as "negative at (upper threshold in seconds for institution.)"

You might want to review the lab report.

Activated Partial Thromboplastin Time (APTT), Plasma
Recommendations for appropriate activated partial thromboplastin time reagent selection and utilization.