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HelpTest Code LTT Lactose Tolerance Test
Additional Codes
Epic EAP: LAB3085
Epic Description: LACTOSE TOLERANCE TEST
Synonym
Lactose-Blood
Collection Limitations
This test must be started before 10:30 AM – Monday through Friday only.
Specimen Type
Blood
Specimen Required
| Collection Container | Preferred Volume | Minimum Volume | |
|---|---|---|---|
| Preferred |
Gray, Sodium Fluoride & Potassium Oxalate |
4.0 mL | 1.0 mL |
| Alternate | Green, Lithium Heparin with Inert Gel OR Gold, Clot Activator with Inert Gel | 4.0 mL | 1.0 mL |
| Preferred Micropuncture | Green Micro, Lithium Heparin with Inert Gel | 2 X 0.6 mL | 2 X 0.6 mL |
| Alternate Micropuncture | Gold Micro, Clot Activator with Inert Gel | 2 X 0.6 mL | 2 X 0.6 mL |
Instructions for Collection and Transport
The first collection is a fasting collection. All remaining collections are collected AFTER appropriate administration of a lactose dose at specified timed intervals for the duration of the test. Specimens are drawn at 15, 30, 60, 90 and 120 minutes after ingestion of lactose. Centrifuge specimen. For non-gel tubes, aliquot serum into plastic vial. Transport refrigerated on freeze packs. If holding overnight, aliquot serum/plasma into plastic vial and refrigerate.
Aliquot Requirements
Plasma or Serum
Optimum 1.0 mL
Minimum 0.5 mL
Performing Lab
Chemistry Lab
Assay Frequency
Daily
Routine Turnaround Time
1 day
CSR Storage Requirements
Centrifuge and deliver to laboratory.
CPT Code Information
82951
82952 x 3
Patient Preparation
Patient must be fasting. After a fasting blood sample is collected, the patient is given 50 grams of lactose orally. The patient should not eat or drink anything (including chewing gum & mints) during this test. This procedure will take approximately 2 hours.