Table 3

CALIPER published reference intervals for several analytes relevant to the assessment of iron status in children

Analyte	Unit	Age range	Reference interval	Sample size, n	Reagent manufacturer	Study source	Reference
hsCRP	mg/L	0 to <14 days	0.3–6.1	139	Abbott	CALIPER	10
hsCRP	mg/L	15 days to <15 years	0.1–1.0	653	Abbott	CALIPER	10
Serum ferritin	µg/L	0 to <15 days	39.8–539.9	56	Beckman	CALIPER	15
		15 days to <6 months	15.3–374.6	49
		6 months to <1 year	13.3–191.9	44
		1 to <16 years	10.3–55.8	424
		3–5 years	10.7–85.2	400	Ortho	CHMS	14
		Male 6–16 years	16.2–106.7	680
		Female 6–24 years	9.6–81.9	790
		4 to <15 days	99.6–717.0	127	Abbott	CALIPER	12
		15 days to <6 months	14.0–647.2	172
		6 months to <1 year	8.4–181.9	140
		1 to <5 years	5.3–99.9	126
		5 to <14 years	13.7–78.8	497
Haemoglobin	g/L	3–5 years	113.5–143.1	420	Beckman	CHMS	13
		6–8 years	114.7–143.0	670
		9–10 years	118.4–146.9	540
Iron	µmol/L	0 to <14 years	2.8–22.9	588	Abbott	CALIPER	10
MCV	fL	3–5 years	77.2–89.5	410	Beckman	CHMS	12
MCV	fL	6–11 years	77.8–91.1	1460	Beckman	CHMS	12
Platelets	10⁹/L	3–5 years	187.4–444.6	420	Beckman	CHMS	13
Platelets	10⁹/L	6–9 years	186.7–400.4	910	Beckman	CHMS	13
Transferrin	g/L	0 to <9 weeks	1.04–2.24	188	Abbott	CALIPER	10
		9 weeks to <1 year	1.07–3.24	104
		1 to <19 years	2.20–3.37	878

Reference values are applicable to both sexes, unless specified otherwise.
CALIPER, Canadian Laboratory Initiative on Pediatric Reference Intervals; CHMS, Canadian Health Measures Survey; hsCRP, high-sensitivity C-reactive protein; MCV, mean corpuscular volume.