Complete Blood Count (CBC) Without Differential
Also known as: Hemogram
Use
See comments in Complete Blood Count (CBC) With Differential [005009].
Special Instructions
The test results are typically available within 1 day of specimen pickup. The specimen must be maintained at room temperature after being collected in a lavender-top EDTA tube. Ensure to invert the tube 8 to 10 times immediately after collection to mix the blood with the anticoagulant, and fill the tube to capacity to avoid rejection.
Limitations
The CBC Without Differential does not provide specific white blood cell subtype counts, which may be necessary for diagnosing certain conditions. Hemolysis, clotted specimens, or incorrect volume in tubes can affect results and lead to rejection. The test requires whole blood collected in EDTA, and samples must not be frozen as this destabilizes the specimen, making it unusable for accurate measurements.
Methodology
Automated Analyzer (Hematology)
Biomarkers
LOINC Codes
- 58410-2
- 6690-2
- 789-8
- 718-7
- 4544-3
- 787-2
- 785-6
- 786-4
- 788-0
- 777-3
- 58413-6
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Whole Blood
Volume
Fill tube to capacity.
Minimum Volume
0.5 mL (500 μL for pediatric microtainer capillary tubes)
Container
Lavender-top (EDTA) tube
Collection Instructions
Invert tube 8 to 10 times immediately after tube is filled at the time of collection.
Storage Instructions
Maintain specimen at room temperature.
Causes for Rejection
Hemolysis; tube not filled with minimum fill volume; specimen drawn in any anticoagulant other than EDTA; specimens diluted or contaminated with IV fluid; clotted specimen; improper labeling; transfer tubes with whole blood; lavender-top (EDTA) tubes received with plasma removed
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 day |
| Refrigerated | 3 days |
| Frozen | Unstable |