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P1 Antigen-Antibody Complex (P1-PAC)

Published: July 27, 2026Updated: August 25, 2026

The P1 Antigen-Antibody Complex (P1-PAC) measures the levels of P1 antigen and its corresponding antibodies in the blood, which are crucial for understanding coagulation disorders.

Quick summary

P1-PAC is a diagnostic biomarker for coagulation disorders with a reference range of 0–400 μg/L.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
μg/L
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche PAP, Stago PAP, Dade Behring PAP
interpretation: {"text":"May indicate a bleeding disorder or deficiency in P1 antigen.","label":"Low P1-PAC"}; {"text":"May suggest a risk of thrombosis or hypercoagulability.","label":"High P1-PAC"}

P1 Antigen-Antibody Complex (P1-PAC) is a biomarker used to assess the levels of P1 antigen and its antibodies in the blood. This measurement is important for diagnosing and managing coagulation disorders, as abnormal levels can indicate an increased risk of thrombosis or bleeding.

The P1-PAC test is particularly useful in identifying deficiencies or excesses of P1 antigen, which can affect the balance of the coagulation cascade. This balance is critical for normal blood clotting and wound healing.

Levels of P1-PAC outside the reference range of 0–400 μg/L may suggest a need for further investigation or intervention. Elevated levels can be associated with hypercoagulability, while decreased levels may indicate a bleeding disorder.

Frequently asked questions

What is the normal range for P1-PAC?
The normal range for P1-PAC is 0–400 μg/L.
What conditions can cause abnormal P1-PAC levels?
Abnormal P1-PAC levels can be caused by coagulation disorders, such as thrombosis or bleeding disorders.
  1. 1
    Coagulation Biomarkers: P1 Antigen-Antibody ComplexSource
  2. 2
    Clinical Applications of P1-PAC TestingSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy