LOINC Code 3055-1: T3/Triiodothyronine (T3) uptake index [Ratio]

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/Triiodothyronine uptake index. 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: DISCOURAGED
• Order vs observation: Observation

What it does not mean

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

Key facts

• Triiodothyronine (T3)/Triiodothyronine (T3) uptake index [Ratio] in Serum or Plasma
• Triiodothyronine/Triiodothyronine uptake index
• Chemistry; Endocrine; Endocrinology; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; T3; T-3; T3 uptake index; T3U; T3uptake; 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