LOINC Code 25804-6: Free T3 2nd specimen post Unsp challenge [Moles/Vol]

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 Triiodothyronine.free^2nd specimen post XXX challenge. 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: Observation

What it does not mean

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

Key facts

• Triiodothyronine (T3) Free [Moles/volume] in Serum or Plasma --2nd specimen post XXX challenge
• Triiodothyronine.free^2nd specimen post XXX challenge
• After; CHEMISTRY.CHALLENGE TESTING; Convalescent; Endocrine; Endocrinology; FR; Free T3; FT3; Level; Non-protein bound; p chal; Pl; Plasma; Plsm; Point in time; Post immunization; PST; QNT; Quan; Quant; Quantitative; Random; Second; SerP; SerPl; SerPlas; Serum; Serum or plasma; sp2; sp2 p chal; Spec; SR; Substance concentration; T3; T-3; T3Free; thyroid hormone; Total T3; Triodothyrne

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