Glucose, Gestational Screen (50g), 140 Cutoff
Test code
CPT code(s)*
Test resources
Details
Methodology
Spectrophotometry (SP)
Alternative name(s)
Glucose, Gestational Screen,Gestational, Glucose
Specimen requirements | |
|---|---|
| Patient preparation | None Specified |
| Preferred specimen(s) | 1 mL plasma collected in a fluoride/oxalate (gray-top) tube |
| Alternative specimen(s) | Plasma from fluoride/oxalate (gray-top) tube in a plastic screw-cap vial • Serum (separated from cells immediately) in a plastic screw-cap vial • Spun SST • Plasma from lithium heparin (green-top) tube in a plastic screw-cap vial • Plasma from sodium heparin (green-top) tube in a plastic screw-cap vial |
| Minimum volume | 0.5 mL |
| Collection instructions | The test should be performed between weeks 24 and 28 of gestation. The patient is given a 50 g dose of glucose and a single blood specimen is obtained one hour later. Fasting is not required. Note: Serum and plasma submissions must be separated from cells. |
| Transport container | Fluoride/oxalate (gray-top) tube |
| Transport temperature | Room temperature |
| Specimen stability | Serum Room temperature: 4 days Refrigerated: 7 days Frozen: 28 days Whole blood (gray-top) tube Room temperature: 24 hours Refrigerated: 72 hours Frozen: Unacceptable Sodium fluoride plasma Room temperature: 7 days Refrigerated: 7 days Frozen: 28 days Heparinized plasma Room temperature: 48 hours Refrigerated: 7 days Frozen: 28 days |
| Reject criteria | Unspun serum or plasma separator tube (SST or PST) • Red-top or green-top tube (serum or heparinized plasma not separated from cells) • Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate |
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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