ptt

PTT is an acronym that can refer to several unrelated terms across different fields. The most common meanings include a communication technology term, a medical laboratory test, and a major Thai energy company.

Push-to-Talk, abbreviated PTT, describes a method of voice communication in which a user transmits audio by pressing and holding a button, while others listen. This half-duplex setup is widely used in two-way radios, dispatch systems, and some consumer and enterprise communications apps. PTT can operate over cellular networks or dedicated radio links and often supports features such as group calls, private calls, and transmission alerts. Its advantages include quick, direct communication and reduced channel contention, though it can introduce latency and dependence on network quality.

Partial Thromboplastin Time is a laboratory test used to evaluate the intrinsic and common coagulation pathways in blood. In testing, patient plasma is combined with phospholipid reagents and calcium, and the time to clot formation is measured in seconds. PTT is commonly used to monitor anticoagulant therapy with unfractionated heparin and to screen for coagulation disorders. Reference ranges vary by reagent and instrument, and results must be interpreted in the context of clinical findings and other coagulation tests such as the prothrombin time (PT).

PTT Public Company Limited refers to a major Thai energy company, historically state-influenced, active in oil, gas, and petrochemical activities. It operates as a holding entity with a network of subsidiaries and affiliates and is listed on the Stock Exchange of Thailand. In Thailand, PTT plays a central role in the energy sector and in the development of related industries.