LOINC Code 100978-6: Thyroxine.free.gestational IA [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.gestational. 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

• Thyroxine.free.gestational [Moles/volume] in Serum or Plasma by Immunoassay
• Thyroxine.free.gestational
• During pregnancy, a two-step immunoassay procedure which involves an extra step to remove interfering substances can be performed. There are often separate reference intervals by gestational age.
• Chemistry; EIA; ELFA; ELISA; Enzyme immunoassay; FR; FreeT4; FT4; Gest; Gestation; IAA; Level; Levothyroxine; Levo-thyroxine; L-thyroxine; MEIA; Non-protein bound; Pl; Plasma; Plsm; Point in time; Prenatal; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration; SUDS; 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