OGTT Methods (for Pregnant) & GDM Criteria

Question 1

OGTT Old Methods

Answer 1

1. JANNEY-ISAACSON METHOD / SINGLE DOSE METHOD
2. EXTON ROSE METHOD / DOUBLE DOSE / DIVIDED ORAL DOSE

Question 2

old method that uses 75g glucose load

Answer 2

single dose method

Question 3

old method that uses 100g glucose load

Question 4

fasting for single & double dose method

Answer 4

atleast 10 hours

Question 5

single dose method (75g) total number of blood spx

Answer 5

4 blood spx

fbs
1h
2h
3h

Question 6

double dose method (100g) total number of blood spx

Answer 6

3 blood spx

fbs
— administer 50g,
after 30 min, 1st glucose load
— administer remaining 50g,
after 30 min, 2nd glucose load

Question 7

OGTT New Methods

Answer 7

ONE-STEP METHOD (IADPSG)

TWO-STEP METHOD (NIH Consensus)

Question 8

One step method blood spx:

Answer 8

3 blood spx

FBS
— glucose load (75g)
1hr
2hr

Question 9

Performed glucose measurement of blood sample collected 1 hour after 50g glucose load

Answer 9

Two-Step Method (NIH consensus) SCREENING

Question 10

Proceed to 100g OGTT (next day) only if (+) for screening with value of:

Answer 10

1hr is ≥140 mg/dL

Question 11

TWO-STEP METHOD Fasting

Screening:

100g OGTT:

Answer 11

Screening: not required (routinely performed)

100g OGTT: required

Question 12

TWO-STEP METHOD blood spx

Answer 12

4 blood spx

FBS
— drink glucose load 100g
1hr
2hr
3hr

Question 13

criteria for diagnosis of GDM

IADPSG CONCENSUS / ONE-STEP
meets _ criteria

Answer 13

meets 1/3 criteria

FBS: ≥92 mg/dL
1 HR-GTT: ≥180 mg/dL 2-HR GTT: ≥153 mg/dL

Question 14

criteria for diagnosis of GDM

NIH CONSENSUS / TWO-STEP
meets _ criteria

Answer 14

meets 2/4 criteria

(+) 50g Screening: 1hr ≥140 mg/dL —> 100g

• FBS: >95 mg/dL
• 1 HR-GTT: ≥180 mg/dL
• 2 HR-GTT: ≥155 mg/dL
• 3 HR-GTT: ≥140 mg/dL