LOINC Code 50391-2: Coagulation PTT circulating inhibitor Ql (PPP)

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Coagulation. It is commonly used with the system or sample type PPP.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Observation
• Method: Coag.Surface induced circulating inhibitor

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Coag.Surface induced circulating inhibitor [Presence] in Platelet poor plasma by Coagulation assay
• Coagulation
• PTT (aPTT) circulating inhibitor is part of the PTT mixing study. When addition of normal plasma fails to correct the clotting time into the normal range, the cause of the abnormal test is likely an inhibitor rather than a clotting factor deficiency.
• aPTT; Circ; Clot; Clottable; Coag; Coagulation assay; Hematology; Heme; Inhib; Inhibit; Ordinal; Plas; Platelet poor plasma; Point in time; PR; PTT circulating inhib; Ql; Qual; Qualitative; Random; Screen; Surf; Tilt tube

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions