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Test Code OBGTT (in EPIC) Print out and use as reqn'n (GGTT, GTS, GTS and GTSP in SQ) Glucose Tolerance Test, Gestational, Plasma

Specimen and Container/Tube

Blood

Rejection Criteria

Whole blood/unspun samples greater than 6 hours will be
rejected.

Test Includes

quantitative glucose in plasma on fasting (10 hours)
specimen
and specimens collected 1, 2 and 3 hours post ingestion of 100
gram
glucose load.

Specimen Type

Blood

Preferred Volume

4 mL

Offsite Collection Instructions

Refer to Gestational Glucose Tolerance testing protocol in
the
Glucose


Tolerance Testing Collection link
 

Patient must fast at least 10 hours prior to test
protocol.  Samples must be labeled with patient name,
medical
record number and elapsed time since glucose beverage
ingestion ingestion (i.e. 60, 120 and 180 minutes).
 

No smoking, gum-chewing, drinking, or eating during test.
The
patient may imbibe small volumes of water. The patient should
remain seated as much of the time as possible.

UCMC Collection Instructions

Refer tp Gestational Glucose Tolerance testing protocol in
the
Glucose


Tolerance Testing Collection link
 

Patient must fast at least 10 hours prior to test
protocol.  Samples must be labeled with patient name,
medical
record number and elapsed time since glucose beverage
ingestion ingestion (i.e. 60, 120 and 180 minutes).
 

No smoking, gum-chewing, drinking, or eating during test.
The
patient may imbibe small volumes of water. The patient should
remain seated as much of the time as possible.

Test Usage

The GGTT is
a diagnostic test for
diabetes in pregnant patients, usually between 24 and 28 weeks
of
pregnancy. Venous plasma glucose is measured in a fasting
patient before and at 1, 2, and 3 hour intervals after an oral
dose
of 100 gm of glucose.

Critical Results

Critical value <40 or >500mg/dL

Fee Code

43108, 43375 x3

Container/Tube

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Specimen Minimum Volume

2 mL

Day(s) Performed

24/7

STAT DAY(S) AND TIME(S) PERFORMED

Not Available

CPT

82951, 82952 x3

Method Name

Spectrophotometric, enzymatic endpoint

Reference Values

Any two results reaching or exceeding the following limits
for
a
100 gram oral glucose load are generally considered definitive
for
the diagnosis of gestational diabetes mellitus (GDM);
however, exceptions
can occur (see references
below).:

  • Fasting level 95 mg/dL
  • 1 hour level of 180 mg/dL
  • 2 hour level of 155 mg/dL
  • 3 hour level of 140 mg/dL
    ?�

REFERENCES

1. Gestational diabetes mellitus.Diabetes Care 26 (Suppl 1);
S103-S105, 2010.

2.?�Diagnosis and Classification of diabetes mellitus.
Diabetes Care ;2033 (Suppl 1):S62-S69, 2010

Reject Due To

Whole blood/unspun samples greater than 6 hours will be
rejected.

Pediatric Volume

2 mL

Clinical Indications

The GGTT is
a diagnostic test for
diabetes in pregnant patients, usually between 24 and 28 weeks
of
pregnancy.?�Venous plasma glucose is measured in a fasting
patient before and at 1, 2, and 3 hour intervals after an oral
dose
of 100 gm of glucose.

Transport Instructions

Refer to Gestational Glucose Tolerance testing protocol in
the
Glucose



Tolerance Testing Collection link
?�

Patient must fast at least 10 hours prior to test
protocol.?� Samples must be labeled with patient name,
medical
record number and elapsed time since?�glucose beverage
ingestion?�ingestion (i.e. 60, 120 and 180 minutes).
?�

No smoking, gum-chewing, drinking, or eating during test.
The
patient may imbibe small volumes of water. The patient should
remain seated as much of the time as possible.

Test Components

quantitative glucose in plasma on fasting (10 hours)
specimen
and specimens collected 1, 2 and 3 hours post ingestion of 100
gram
glucose load.

Methodology

Spectrophotometric, enzymatic endpoint