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Official Description

Lactose, urine, qualitative

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 83633 refers to a laboratory test that is specifically designed to detect and measure the presence of lactose in urine, a condition known as lactosuria. Lactose is a type of disaccharide sugar that is primarily found in milk and dairy products. In a healthy digestive system, lactose is broken down into its constituent sugars, glucose and galactose, by the enzyme lactase. However, in certain conditions, such as lactose intolerance, the body is unable to effectively break down lactose, leading to its absorption into the bloodstream and subsequent excretion in urine. This test is particularly relevant in specific populations; for instance, lactosuria can be a normal finding in late pregnancy and during lactation, especially when milk flow is obstructed. Additionally, it may occur transiently in newborn infants without any gastrointestinal symptoms. The presence of lactose in urine can indicate underlying issues related to lactose metabolism and absorption, making this test a valuable tool in diagnosing lactose intolerance and other related disorders.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The qualitative urine test for lactose (CPT® Code 83633) is indicated for the following conditions:

  • Lactose Intolerance This condition occurs when the body lacks sufficient lactase enzyme to break down lactose, leading to its presence in urine.
  • Pregnancy Lactosuria may be a normal finding in late pregnancy, particularly when milk flow is obstructed.
  • Lactation During lactation, the presence of lactose in urine can be observed, especially if there are issues with milk flow.
  • Newborn Infants Transient lactosuria may occur in newborns without gastrointestinal symptoms, indicating a temporary inability to metabolize lactose.

2. Procedure

The procedure for testing lactose in urine involves several key steps to ensure accurate results. First, a urine sample is collected, which can be obtained either through random voiding or catheterization, depending on the clinical scenario and patient condition. Once the sample is collected, it is sent to the laboratory for analysis. The qualitative test for lactose is performed using chromatography, a technique that separates the components of the urine sample. This method allows for the detection of lactose, providing a clear indication of its presence in the urine. The results of this test can help healthcare providers assess the patient's ability to metabolize lactose and determine if further investigation or dietary modifications are necessary.

3. Post-Procedure

After the lactose urine test is completed, the healthcare provider will review the results to determine the presence and level of lactose in the urine. If lactose is detected, the provider may discuss the implications of the findings with the patient, including potential dietary changes or further testing for lactose intolerance. It is important for patients to follow any additional recommendations provided by their healthcare provider based on the test results. There are typically no specific post-procedure care requirements for this test, but patients should be informed about the significance of the results and any necessary follow-up actions.

Short Descr TEST URINE FOR LACTOSE
Medium Descr LACTOSE URINE QUALITATIVE
Long Descr Lactose, urine, qualitative
Status Code Statutory Exclusion (from MPFS, may be paid under other methodologies)
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 9 - Not Applicable
Multiple Procedures (51) 9 - Concept does not apply.
Bilateral Surgery (50) 9 - Concept does not apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 9 - Concept does not apply.
Co-Surgeons (62) 9 - Concept does not apply.
Team Surgery (66) 9 - Concept does not apply.
Diagnostic Imaging Family 99 - Concept Does Not Apply
CLIA Waived (QW) No
APC Status Indicator Conditionally packaged laboratory tests
Type of Service (TOS) 5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS) T1H - Lab tests - other (non-Medicare fee schedule)
MUE 1
CCS Clinical Classification 233 - Laboratory - Chemistry and Hematology
Date
Action
Notes
2015-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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