How to define anemia in children with chronic kidney disease?

Area of Science:

• Nephrology
• Pediatric Hematology
• Clinical Chemistry

Background:

• Anemia is a common complication in children with chronic kidney disease (CKD).
• Current anemia definitions, such as the Kidney Disease Outcomes Quality Initiative (KDOQI) guidelines, may not accurately reflect the prevalence of anemia in pediatric CKD populations.
• Age- and gender-specific reference intervals are crucial for accurate anemia assessment in children.

Purpose of the Study:

• To compare the prevalence of anemia in children with CKD using age- and gender-specific reference intervals versus the KDOQI definition.
• To evaluate the agreement between conventional and KDOQI anemia definitions in pediatric CKD.
• To investigate the correlation between glomerular filtration rate (GFR) and anemia parameters in children with CKD.

Main Methods:

• A cross-sectional study involving 351 children with CKD stages I-V.
• Anemia prevalence was assessed using age- and gender-specific hemoglobin (Hgb) and hematocrit (Hct) reference intervals and the KDOQI definition (Hgb < 110 g/L).
• Cystatin C-based GFR was measured, and correlations with Hgb and Hct Z-scores were analyzed.

Main Results:

• Age- and gender-specific criteria identified significantly more children with anemia (90 for Hgb, 78 for Hct) compared to KDOQI guidelines (54 for Hgb, 56 for Hct).
• There was a significant correlation between GFR and both Hgb Z-score (p=0.0068) and Hct Z-score (p=0.0128).
• Poor agreement was observed between conventional and KDOQI definitions of anemia in this pediatric CKD cohort.

Conclusions:

• Age- and gender-specific reference intervals are more sensitive in detecting anemia in children with CKD than the KDOQI definition.
• The findings suggest that current KDOQI guidelines may underestimate anemia prevalence in pediatric CKD.
• Revised anemia assessment criteria, incorporating age- and gender-specific values, are warranted for children with CKD.