Diabetes Risk–Asymptomatic Adults
Also known as: Diabetes Risk Assessment, Prediabetes Screen
Use
Screen for prediabetes and diabetes in asymptomatic adults
Special Instructions
For plasma glucose, it is critical to spin the samples soon after collection. SST tubes should clot for about 30 minutes and be centrifuged within 45 minutes. Without prompt centrifugation, glucose levels can decrease factitiously. It is important to label the specimen as plasma and ensure it is mixed well. For A1c, avoid clots and hematocrit disorders to prevent erroneous results.
Limitations
Hemoglobin A1c readings can be affected by any condition that shortens erythrocyte lifespan, such as hemolytic anemia. Glycated hemoglobin F is not detected. Specimens high in Hb F (>10%) may lead to lower than expected Hb A1c results. For FPG, diurnal variations mean higher readings in the morning than in the afternoon, and glycolysis can falsely lower results unless promptly centrifuged and inhibited with preservatives like sodium fluoride.
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 1558-6
- 4548-4
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Whole Blood
Volume
4 mL whole blood
Minimum Volume
4 mL whole blood
Container
lavender-top (EDTA) tube; green-top (lithium heparin) tube; gray-top (sodium fluoride) tube
Collection Instructions
The usual precautions in the collection of venipuncture samples should be observed. The sample must be free of clots. Send the entire tube to the laboratory.
Storage Instructions
Maintain at room temperature.
Causes for Rejection
Clotted specimen; gross hemolysis.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
Other tests from different labs that may be relevant