Sign in →

Test Code LTT3 Lactose Tolerance Test, 3 Hour

Important Note

It is recommended for this test to be collected at the Hunterdon Medical Center Outpatient Department, please call 908-237-5529 to schedule an appointment.

Performing Laboratory

  • Hunterdon Medical Center Laboratory

Special Instructions

Patient Preparation:

1. Patient should be fasting 10-12 hours prior to baseline draw.

2. Patient may have water before and during test.

3. Patient must be prepared to remain in the testing area for the duration of the test (3.5-4 hours).

Testing Protocol:

1. Patient's glucose level is checked by fingerstick.

2. Fasting blood specimen is collected by venipuncture.

3. Patient is given measured amount of lactose to drink.

4. Blood specimens are collected at the following intervals after completion of the lactose drink:

           30 minutes, 1 hour, 2 hour and 3 hours

 

Physician Practice Collection

Refer to FORMS (printable Patient Instructions) for collection.

Specimen Required

 

Container/Tube  
Acceptable  PST (Li Hep) Gel- Mint Green Top
Acceptable  SST
Specimen Volume  3.0mL
Minimum Volume  1.0mL

Specimen Type

Plasma/Serum

Specimen Transport Temperature

Ambient

Specimen Stability

 

Specimen Temperature Time Frame
Plasma Refrigerated 2-8°C 3 days
Serum-gel tube Refrigerated 2-8°C 3 days

Updated June 2020 

Day(s) Test Set up

Hours of testing: Tuesday – Friday (7am -11am)

Reference Values

Fasting: 74-98 mg/dL

Methodology

Enzymatic reference method with hexokinase.

CPT Code

82951

Loinc Code

30min: 26777-3

1hr: 26778-1

2hr: 26780-7

3hr: 26781-5