CF161ZZ
Planar Nuclear Medicine Imaging Liver and Spleen to None with None, Technetium 99m (Tc-99m) Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | C Nuclear Medicine |
| Body System | F Hepatobiliary System and Pancreas |
| Operation | 1 Planar Nuclear Medicine Imaging |
| Body Part | 6 Liver and Spleen |
| Approach | 1 Technetium 99m (Tc-99m) |
| Device | Z None |
| Qualifier | Z None |
Operation Definition
Introduction of radioactive materials into the body for single plane display of images developed from the capture of radioactive emissions
Procedure Overview
Planar nuclear medicine imaging of the hepatobiliary system and pancreas centers on the hepatobiliary iminodiacetic acid (HIDA) scan, in which a radiotracer is injected intravenously, taken up by the liver, and excreted into the bile ducts, gallbladder, and small intestine. A gamma camera captures a series of flat images over roughly one to four hours as the tracer moves through this pathway, showing whether bile flows normally from the liver into the gallbladder and out into the intestine.
The scan is ordered most often to diagnose acute cholecystitis when ultrasound findings are inconclusive, since a gallbladder that fails to fill with tracer strongly suggests obstruction of the cystic duct. It is also used to evaluate biliary leaks after gallbladder surgery or liver transplant, chronic gallbladder dysfunction measured through an ejection fraction after a fatty meal or medication is given, and, less commonly, biliary atresia in infants.
Anatomy & Axis Detail
Liver and Spleen
Imaging the liver together with the spleen exploits the fact that both organs contain phagocytic reticuloendothelial cells that take up colloidal radiotracer from the blood, allowing a single planar study to map the size, shape, and functional tissue distribution of each organ side by side. This combined view is particularly useful for detecting focal hepatic lesions such as tumors or abscesses that appear as photopenic defects against normally uptaking parenchyma, and for assessing conditions like cirrhosis or portal hypertension where blood flow shifts away from the liver and colloid uptake increases in the spleen instead. Because the two organs lie adjacent to one another across the upper abdomen, anterior, posterior, and sometimes lateral views are obtained to separate overlapping activity and to estimate the relative proportion of tracer distributed to each organ, a ratio that itself carries diagnostic meaning.
Radionuclide: Technetium 99m (Tc-99m)
Technetium 99m (Tc-99m) is the most widely used radionuclide in Nuclear Medicine, valued for its short half-life and favorable gamma energy for imaging bone, cardiac, renal, and other organ systems. In this axis position it records that a technetium-based radiopharmaceutical was the tracer administered for the study, distinguishing it from the many other specific isotopes, such as thallium or iodine compounds, used for more specialized indications.
Coding & Documentation
Coding relies on the report confirming a single-plane, sequential imaging technique rather than a tomographic reconstruction, along with the radioisotope used, typically a technetium-99m labeled iminodiacetic acid derivative. When the study includes a pharmacologic or fatty-meal challenge to calculate a gallbladder ejection fraction, that is part of the same study and does not generate a separate code. A recurring mistake is coding delayed imaging performed hours after the initial injection as a distinct procedure, when it is a continuation of the same planar study and should be captured with a single code.
Commonly Confused With
The main distinction to watch for is Tomographic (Tomo) Nuclear Medicine Imaging of the hepatobiliary system, which would apply only if the camera rotated to build cross-sectional images, something uncommon for standard HIDA protocols but occasionally used for complex biliary anatomy. It is also sometimes confused with liver-spleen scans or sulfur colloid studies that assess liver parenchyma rather than biliary excretion; the tracer type and the structures the report describes as being evaluated, biliary tree versus liver tissue itself, separate the two.