Table 2 Lower reference limits (2.5th percentile) for ferritin in µg/L among pediatric patients for females.

From: Clinical thresholds for diagnosing iron deficiency: comparison of functional assessment of serum ferritin to population based centiles

Age

CLSI Parametric

CLSI Rank

Fractional polynomial

Correlation between ferritin and erythrocyte parameters

Hoq et al.33

Adeli et al.11

Hb

MCV

MCH

MCHC

RDW

Roche e602

Abbott

Roche c702

Siemens

Beckman

Abbott

Beckman

Ortho 5600

2

4.3

5

2.5

10

8

5

11

5

12.5

10.1

8.5

9

9

5

10.3

9.51

3

5.0

4

6.3

10.7

8.1

6.8

7.3

7.3

4

7.2

7

8.0

9.4

6.8

5.7

6.1

6.1

5

9.1

8

8.8

10

6

4

10

5

8.6

6

4.9

5.4

5.4

14

6

9.6

9

9.1

8

5.4

4.2

4.8

4.8

7

10.5

10

9.2

7.6

5

3.8

4.4

4.4

8

11.8

11

9.0

7.3

4.8

3.4

4.2

4.1

9

12.7

13

8.7

7.1

4.7

3.1

4

3.9

10

11.0

10

8.4

7

4.7

2.9

3.9

3.8

11

10.9

10

8.0

7

4.7

2.8

3.9

3.8

12

7.8

7

7.5

7

4.8

2.6

3.9

3.8

13

7.3

7

7.0

11

7

5

9

3

7

5

2.6

3.9

3.8

8.28

14

5.8

5

6.5

7.1

5.2

2.5

4

3.9

 

15

5.9

6

6.0

7.3

5.4

2.5

4.1

4

16

5.6

5

5.5

7.4

5.7

2.5

4.3

4.2

3.2

17

5.6

6

5.6

7.6

6

2.6

4.5

4.3

18

5.6

6

5.1

7.8

6.3

2.6

4.6

4.5

  1. Comparison of previously published lower reference limits for ferritin (µg/L) and the results of this study. Reference intervals for the parametric and polynomial analyses can be found in the supplementary table S1.
  2. Hb hemoglobin, MCV mean corpuscular volume, MCH mean corpuscular hemoglobin, MCHC mean corpuscular hemoglobin concentration, RDW red cell distribution width.