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Pathology and Laboratory Medicine
Test Catalogue

​Lactose Tolerance


​Ordering Recommendation

  • ​Lactose Tolerance must be pre-booked with the collection site
  • Patient are recommended to fast for 10 to 14 hours (maximum 16 hours)

​Specimen Requirements​

  • ​Plasma
​Collection Procedure
  • ​Collect fasting blood glucose sample
  • If patient is an adult administer 50 gram lactose drink
    • If patient is ≤ 12 years old calculate the correct dosage of lactose drink to give
  • Patient should remain at collections site and rest during testing period
    • They should not eat or drink anything other than water during the testing period
  • Collect blood glucose samples at 30, 60, and 90 minutes from the time patient has finished the lactose drink
​Required Volume
  • ​Optimal Volume: 4.5 mL Full collection tube
  • Minimum Volume: 1 mL
    (Submitting the minimum volume makes it impossible to repeat the test or perform confirmatory/reflex testing. In some situations, a minimum volume may require a second collection.)
  • Pediatric Volume
  • ​1 hours on cells
  • 3 days at 2 - 8°C
Grounds for Rejection​

Testing Information​ ​

  • ​Collection available while testing sites are open
  • Testing available 24 hours a day
Testing Site​
  • ​RUH, SPH
  • Rural-Humboldt
  • Midtown Lab Collection Site
Results Reporting​
  • In hospital reported within 2 hours
  • Community urgent and inter-hospital reported within 4 hours
  • Community routine reported within 24 hours
  • Critical results ≤ 2.5 and ≥ 25 mmol/L will be phoned
  • ​Hexokinase method (photometric)
  • Rural-colorimetric
​Specimen Retention
  • ​3 days
SHR LIS Test Code​
  • ​LACTO (For Laboratory Use Only)


​If you choose to print this information, it is valid only on date of print.

Laboratory Controlled Document LSM-166 v4

Last Modified: Friday, October 25, 2019 |
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