What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 82368-2: Thyroid secretory capacity Calculated by SPINA [Moles/Time]

Name: LOINC Code 82368-2: Thyroid secretory capacity Calculated by SPINA [Moles/Time]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:08.165Z

82368-2 is a LOINC code used to identify Thyroid secretory capacity Calculated by SPINA [Moles/Time] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Thyroid secretory capacity. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

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 Thyroid secretory capacity. 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: Calculated.SPINA

What it does not mean

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

Key facts

Thyroid secretory capacity [Moles/time] in Serum or Plasma by Calculated.SPINA

Thyroid secretory capacity

Thyroid secretory capacity (also called thyroid output or GT) is the maximum secretion rate of the thyroid gland under stimulated conditions. The structure parameter inference approach (SPINA) uses Michaelis-Menten functions and pharmakokinetic data to estimate GT under conditions of substrate saturation. One calculation is based on peripheral TSH, free T4, thyroid binding globulin and thyroid binding prealbumin values, and an alternate calculation uses peripheral TSH and total T4. GT calculated using the SPINA approach is also known as SPINA-GT. SPINA-GT may be useful in diagnosing secondary or tertiary thyroid conditions and has also been shown to be able to clearly differentiate between euthyroidism and functional thyroid disorders of primary origin. [PMID27375554] Peripheral deiodinase activity by SPINA, called SPINA-GD, is a related result [LOINC: 82367-4].

Calc; Calc SPINA; Calculation; Chemistry; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SPINA-GT; SR; sRate; Substance Rate; Thyr secr cap; Thyroid capacity; Thyroid output

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

Thyroid secretory capacity Calculated by SPINA [Moles/Time]Thyroid secretory capacity [Moles/time] in Serum or Plasma by Calculated.SPINAThyr secr cap SerPl Calc SPINA-sRateThyroid secretory capacityCHEMThyroid secretory capacity, BloodSRat

Frequently asked questions

Code details

Code82368-2

SystemLOINC

Display nameThyroid secretory capacity Calculated by SPINA [Moles/Time]

DescriptionThyroid secretory capacity

Short nameThyr secr cap SerPl Calc SPINA-sRate

ComponentThyroid secretory capacity

PropertySRat

TimingPt

System (specimen)Ser/Plas

ScaleQn

MethodCalculated.SPINA

ClassCHEM

Example unitspmol/s

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.58

Last changed2.58

Consumer names

Thyroid secretory capacity, Blood

Part names

Thyroid secretory capacitySRatPtSer/PlasQnCalculated.SPINASubstance RatePoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.