Alberta Precision Laboratories

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Message Alert:	PLEASE NOTE: This Test Directory is in an interim state and due to changes pertaining to the DynaLIFE transition, performing site for routing has not been updated. Please refer to Laboratory Information System for appropriate routing.

Test Name/Synonym:	LACTOSE - TOLERANCE, 2 hour - Central Zone
LABID (Connect Care):	LAB2350

Primary Container:	MINT LIHEP PST
Alternate Containers:	GOLD SST
Minimum Collection Volume:	Plasma or Serum, 0.5 mL x 4
Specimen Collection Requirements:	For testing referred to DynaLIFE Medical Labs Diagnostic and Scientific Centre. See Lactose tolerance, 2 Hour in the DynaLIFE Test Directory or contact DynaLIFE Specimen Control at 1-800-661-9876 Requisition to Use: Central Zone Laboratory Requisition
Testing Schedule:	Monday to Friday - Not Available Stat

Reference Interval:	A cutoff of 1.1 mmol/L will be used to determine whether the test is normal or abnormal: If a difference of 1.1 mmol/L glucose or greater from baseline to either the 30 min, 60 min, or 120 min time point is observed, the test result is NORMAL. If a difference of less than 1.1 mmol/L glucose from baseline to ALL of the 30 min, 60 min, and 120 min time points is observed, then the result is ABNORMAL.
Critical Value:	0 - 150 yr <2.6 or >24.9 mmol/L
Testing Area:	Chemistry

Performing Site:	Drayton Valley, Drumheller, Hanna, Innisfail, Killam, Lacombe, Olds, Ponoka, Provost, Red Deer, Rimbey, Rocky Mountain House, Stettler, Sundre, Three Hills, Two Hills, Vegreville, Vermilion, Viking, Wainwright, Wetaskiwin or referred to DynaLIFE Medical Labs. Use the applicable referral laboratory test directory if this test is NOT performed on site or referred within Central Zone.
Additional Test Information:	Do not place order. Test must be booked. Please contact the Collection site that you wish to have your test done at. Provide the weight for children if < 23 kg (50 lbs). PATIENT PREPARATION: Fast for a minimum of 8 hours. Fasting is defined as nothing to eat, chew or drink other that small amounts of water. Instruct the patient that they will be given a drink (lactose dissolved in water) and will be required to remain at the laboratory for 2 hours. Also, indicate that the patient will remain fasting during the test i.e., nothing to eat, chew or drink other than small amounts of water. Smoking is NOT permitted during the test. For patients with diabetes, if there is concern about fasting, instruct the patient to consult their physician. Note that the lactose tolerance test will not increase blood glucose by more than 2 mmol/L, i.e. overloading a patient with diabetes with glucose is not a concern. TEST PROCEDURE: The Lab will prepare the lactose solution (50g in 250mL of water). For children <23 kg a dilution will be prepared based on patient weight. Collect the fasting baseline blood sample. Instruct the patient to drink the lactose solution within 5 minutes and then to remain fasting and at rest for the duration of the test. Note the time the drink was given. Collect a blood sample at 30, 60 and 120 minutes from the time that the patient began the drink. Patient may resume normal diet and activities at the conclusion of the test.

Last Updated On:	Tuesday, April 2, 2024
Date of Last Review:	Feb 25 2019 12:00AM

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