What does rdw and rdwsd mean?

RDW stands for "Red Cell Distribution Width," a blood test measurement that indicates the variation in the size of red blood cells, which can help diagnose conditions like anemia. RDW-SD (Red Cell Distribution Width - Standard Deviation) is a specific calculation of the RDW that provides a more precise measurement of the width of the red blood cell size distribution. Both metrics are useful in evaluating blood disorders and overall health.