✍️ Written by the MedTestBD Editorial Team · Last reviewed: July 2026
What is a Whole Blood Test?
A whole blood test refers to laboratory analysis performed directly on unprocessed blood — without separating it into plasma, serum, or cellular components. Whole blood testing is used in point-of-care settings, emergency medicine, and specific analyses where the interaction between blood cells and plasma is clinically relevant. It is also the foundation of blood transfusion medicine, where whole blood or its components are prepared for patients who need them.
Why is a Whole Blood Test Done?
- For rapid bedside testing in emergencies — blood glucose, blood gases, and electrolytes can be measured from whole blood using point-of-care analysers
- For blood typing and crossmatching before transfusion
- For haematology tests such as CBC, where all cellular components must be preserved
- For coagulation studies such as PT, APTT, and D-Dimer, which require whole blood collected in specific tubes
- For therapeutic drug monitoring and toxicology screening, where whole blood levels more accurately reflect tissue exposure than serum
- To collect blood for culture (Blood C/S) — the full blood volume is needed for accurate microbial detection
Key Whole Blood Reference Values
| Parameter | Normal Range |
|---|---|
| Hemoglobin (men) | 13.5 – 17.5 g/dL |
| Hemoglobin (women) | 12.0 – 15.5 g/dL |
| Hematocrit (men) | 41 – 53% |
| Hematocrit (women) | 36 – 46% |
| WBC count | 4,000 – 11,000 cells/µL |
| Platelet count | 150,000 – 400,000 cells/µL |
The specific values measured depend entirely on what the doctor has requested. Whole blood is the starting material — the lab processes it according to the test ordered. Always refer to the individual test report for specific normal ranges and interpretation.
How to Prepare for a Whole Blood Test
- Preparation depends on the specific test being performed — fasting may or may not be required
- Stay well hydrated unless your doctor has advised otherwise — good hydration makes blood collection easier
- Inform your doctor about all medications and supplements you are taking
- A blood sample is collected from a vein in your arm into the appropriate tube for the requested test
Whole Blood Test Price in Bangladesh
Whole blood test prices vary between diagnostic centers across Bangladesh. Compare whole blood test prices on MedTestBD →
⚠️ This information is for general reference only. Always consult a qualified physician before undergoing any medical test.
