Sign in →

Test Code 97644819 GTT Gestational 3 Hour order set

Important Note

This protocol is for pregnant female adult patients only.

Performing Laboratory

Torrance Memorial Laboratories

Specimen Requirements

Submit only 1 of the following specimens:

 

Hospital Preferred Specimen Type: Plasma

Container/Tube: Lithium heparin gel

 

Outreach Preferred Specimen Type: Serum

Container/Tube: Serum gel

Patient instructions during testing:
1.  Patient must be fasting.
2.  Patient must remain in the test area during the test.  Must site quietly.
3.  Patient should not chew gum, smoke, or eat.
4.  Patient may sip water if thirsty.
5.  Tell patient to inform you if they feel week, dizzy, or have symptoms such as malaise or sweating.

Protocol Instructions

1.  Draw fasting sample on patient.  Label with the required information.  Label sample as fasting.

2.  Give 100 gram glucose loading dose (Glucola).

3.  Draw 1 hour sample 1 hour from the time the patient finished drinking the Glucola.  Label with required information and label as 1 hour sample.

4.  Draw 2 hour sample 2 hours from the time the patient finished drinking the Glucola.  Label with required information and label as 2 hour sample.

5.  Draw 3 hour sample 3 hours from the time the patient finished drinking the Glucola.  Label with the required information and label as 3 hour sample.

 

Processing personnel:

  • Order GTT Gestational 3 hour order set. 
  • ORDER AS TIME COLLECTED. 
  • DO NOT ORDER AS RECEIVED. 
  • MUST GENERATE 4 DIFFERENT ACCESSION NUMBERS.
  • Must match fasting label to fasting sample, 1 hour label to 1 hour sample, etc.

Specimen Transport Temperature

Ambient

 

Storage Temperature Stability
Room Temperature (preferred):  24 hours
Refrigerated:  24 hours

Methodology

Spectrophotometry

Reference Range

Interpretive guidelines:  3 Hour Gestational GTT Carpenter/Coustan Criteria

100 gm-Glucose load

mg/dL

Fasting

  95

1 Hr

180

2 Hr

155

3 Hr

140

If two or more of the venous concentrations are met or exceeded, a diagnosis of gestational diabetes can be made.

Day(s) Test Set Up/TAT

Outpatient:

Performed Monday through Friday only.  Prefer to begin tolerance before 9:00 am.

 

Inpatient: 

Contact lab

 

TAT:

Results available same day.

Aliases

.

CPT Code

82947, 82951