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Glucose Tolerance Cystic Fibrosis Fasting

Ordering Info & Methodology

Test Code

Cerner Synonyms


Glucose Tolerance Test, Cystic Fibrosis, Glucose Tolerance Cystic Fibrosis Fasting

Turn Around Time


Ordering Guide

Includes GTCFFB, GTCF1 and GTCF2

Specimen Requirements

Sample Type

Collection Container

Alternate Collection Containers

Lithium Heparin Plasma

Light Green

Gold, Red

0.5 mL

Add on stability
This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.

Minimum Volume

Add On Stability

Collection and Shipping Requirements

Refrigerate. Send on ice pack.

Reference Intervals

Female Reference Interval

Age Category
Reference Interval
≥ 0 y

Male Reference Interval

Age Category
Reference Interval
≥ 0 y
Additional Notes

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Measurement Uncertainty (MU)
Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.


Reported sodium = 140 mmol/L
Sodium MU = 1%
Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L
Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.


Measurement Uncertainty

Patient must be fasting 9 - 12 hours.

Glucose tolerance procedures should only be booked and performed during Monday to Friday between 0700 to approximately noon.


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