LOINC Code 25793-1: Free T4 4th 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 Thyroxine.free^4th 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

• Thyroxine (T4) free [Moles/volume] in Serum or Plasma --4th specimen post XXX challenge
• Thyroxine.free^4th specimen post XXX challenge
• After; CHEMISTRY.CHALLENGE TESTING; Endocrine; Endocrinology; FR; FreeT4; FT4; Level; Levothyroxine; Levo-thyroxine; L-thyroxine; Non-protein bound; p chal; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; sp4; sp4 p chal; Spec; SR; Substance concentration; T4; T-4; T4 Free; thyroid hormone; Thyrox; Thyroxin; Thyrx; Total T4; TT4

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