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Ordering Code	178
Test Name	Glucose, 1 Hr Pregnancy Screen
Alias	Pregnancy Diabetes Screen
Preferred Specimen	Serum Note: If specimen cannot be properly processed within 1 hour of collection, collect blood in Oxalate/Fluoride (Gray)
Preferred Container	SST (Gold)
Other Specimen/Container	Plasma in Sodium Fluoride-Potassium Oxalate (Gray), Serum in Plain (Red), Plasma in Lithium Heparin (Green-PST), Plasma in Lithium Heparin (Dark Green-PP No Gel)
Optimum Volume	1 mL
Collection Instructions	Administer a 50g glucose load. Patient should remain inactive and receive nothing by mouth except for small amounts of water or ice. Collect blood specimen 1 hour post-glucose load.
Handling Instructions	If specimen cannot be properly processed within 1 hour of collection, collect in Sodium Fluoride - Potassium Oxalate (Gray) All other specimen types must be centrifuged within 2 hours of collection. If no gel separation present in tube and testing is delayed, plasma/serum is aliquoted from cells within 2 hours of collection.
Transport Requirements	Oahu: Refrigerated Airline: Refrigerated
Specimen Stability	Ambient: 8 Hours Refrigerated: 3 Days Frozen: 3 Months (Aliquot) Frozen samples should be thawed only once Unprocessed Sodium Fluoride-Potassium Oxalate (Gray) blood is stable 3 days ambient.
Rejection Criteria	Specimen older than stability limits, Grossly hemolyzed, Insufficient quantity, Unprocessed within allowable time limit
Avail. Stat	NO
Analytic Time	1 Day
Methodology	Hexokinase - UV/NAD

Reference range(s)

The reference ranges listed below are valid on this date of July 18, 2025.