RDW-SD (Red Cell Distribution Width – Standard Deviation) is a hematological parameter that measures the variation in red blood cell (RBC) size (anisocytosis). It is reported in femtoliters (fL) and reflects the actual width of the RBC size distribution curve. RDW-SD is useful in diagnosing and differentiating various types of anemia, including iron deficiency anemia, vitamin B12 deficiency, and mixed anemia. It is part of the Complete Blood Count (CBC) and provides valuable information about red blood cell morphology.
Fasting
Not Required
Reporting Time
12 Hours
Gender
Male/Female
Age Group
5-99 yrs.
HAEMATOLOGY
- Complete Hemogram
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