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LOINC Code 70664-8: Parathyrin.intact intraoperative percent change [Mass conc % diff]

70664-8 is a LOINC code used to identify Parathyrin.intact intraoperative percent change [Mass conc % diff] 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 Parathyrin.intact intraoperative percent change. 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 Parathyrin.intact intraoperative percent change. 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

Parathyrin.intact intraoperative percent change in Serum or Plasma
Parathyrin.intact intraoperative percent change
Primary hyperparathyroidism is treated by surgically removing one or multiple glands. The decision on what glands need to be removed is made based on PTH intact levels drawn during the surgical procedure. Differential sampling and intra-operative PTH values also help locate hard to find parathyroid glands. A decrease in PTH of 50% or more from baseline to post-surgery PTH predicts operative success. [1] Source[1] Jacobs and DeMott Laboratory Test Handbook, 5th edition, DS Jacobs, WR DeMott and DK Oxley, 2001.
Chemistry; Exchange; Intact Parathormone; intact parathyroid hormone; iPTH; Parathormone; Parathyroid hormone; Pl; Plasma; Plsm; Point in time; PTH; PTH-Intact; PTH-Intact IO % Dif; QNT; Quan; Quant; Quantitative; Random; Replace; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Tumor marker

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

Parathyrin.intact intraoperative percent change [Mass conc % diff]Parathyrin.intact intraoperative percent change in Serum or PlasmaPTH-Intact IO % Dif SerPlParathyrin.intact intraoperative percent changeCHEMParathyrin.intact intraoperative percent change, BloodMCPctDiff

Frequently asked questions

Code details

Code70664-8
SystemLOINC
Display nameParathyrin.intact intraoperative percent change [Mass conc % diff]
DescriptionParathyrin.intact intraoperative percent change
Short namePTH-Intact IO % Dif SerPl
ComponentParathyrin.intact intraoperative percent change
PropertyMCPctDiff
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHEM
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.40
Last changed2.73

Consumer names

Parathyrin.intact intraoperative percent change, Blood

Part names

Parathyrin.intact intraoperative percent changeMCPctDiffPtSer/PlasQnMass concentration percent differencePoint 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.

LOINC Code 70664-8 | HealthAssure