LOINC Code 73818-7: Heparin induced platelet IgG IA [OD]

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 Platelet factor 4 heparin complex induced Ab.IgG. It is commonly used with the system or sample type Ser/Plas.

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: Both
• Method: IA

What it does not mean

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

Key facts

• Heparin induced platelet IgG Ab in Serum or Plasma by Immunoassay
• Platelet factor 4 heparin complex induced Ab.IgG
• Heparin induced platelet (platelet factor 4, PF4) IgG antibodies are measured in optical density as part of an immunoassay. A OD value of >0.4 is considered an initial positive test. Additional heparin may be added to the patient's serum to determine percent inhibition by heparin (see LOINC 73817-9) and confirm a positive result.
• ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Compx; EIA; ELFA; ELISA; Enzyme immunoassay; Fac; Fact; HAT; Hep; Hepar; Heparin associated thrombycytopenia; Heparin dependent antibodies; Heparin induced thromocytopenia; Heparn; HIT; HITA; IAA; Immune globulin G; Immunoglobulin G; MEIA; Optical density; PF; PF4; PF4 heparin cmplx; PF4-heparin Ab; PI-factor 4; Pl; Plasma; Platelet Ab.heparin induced; Platelet type heparin inactivator; Platelets; Platelt; Plsm; Plt; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; SUDS; Thrombocyte; Thrombocytes

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