SAC Patency Test

SAC Patency Test - Chokher Seba Hospital

The SAC Patency Test, also known as the Syringing and Probing Test, is a simple and important diagnostic procedure performed at Chokher Seba Hospital to check whether the tear drainage system (nasolacrimal duct) is open and functioning properly.

 

Normally, tears drain from the eyes through small openings in the eyelids into the tear sac (lacrimal sac) and then flow into the nose through the nasolacrimal duct. When this system becomes blocked, it can cause excessive tearing, eye watering, discharge, or repeated infections.

 

The SAC Patency Test helps detect:

·         Blockage in the tear drainage pathway

·         Partial obstruction of the nasolacrimal duct

·         Causes of chronic tearing (epiphora)

·         Tear sac infections (dacryocystitis)

·         Pre-surgical assessment before DCR surgery

 

How the test is done:
A small amount of sterile saline is gently injected into the tear duct using a fine cannula. If the saline passes freely into the nose or throat, the passage is open. If it does not pass or flows back from the eye, it indicates a blockage.

 

The procedure is:

·         Quick and safe

·         Performed in the OPD

·         Mildly uncomfortable but not painful

·         Suitable for adults and children (including infants)

 

At Chokher Seba Hospital, the test is conducted by skilled eye specialists using sterile techniques and modern instruments to ensure accurate diagnosis and patient comfort. This helps us determine the right treatment-whether medication, massage techniques for infants, or surgical procedures like DCR if needed.