Normal ionized calcium for 3 year old
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The library doesn't have a pediatric-specific reference range for ionized calcium. Here is the answer from established clinical knowledge:
Normal Ionized Calcium in a 3-Year-Old
Reference range: 1.20 – 1.38 mmol/L (4.8 – 5.52 mg/dL)
This is consistent with the pediatric reference range for ionized (free) calcium, which applies to children roughly 1–18 years of age. Values are slightly higher in infants and neonates.
| Age Group | Ionized Ca (mmol/L) | Ionized Ca (mg/dL) |
|---|---|---|
| Neonates (0–1 month) | 1.22 – 1.48 | 4.88 – 5.92 |
| Infants (1–12 months) | 1.20 – 1.40 | 4.80 – 5.60 |
| Children 1–18 years | 1.20 – 1.38 | 4.80 – 5.52 |
| Adults | 1.15 – 1.35 | 4.60 – 5.40 |
Key points:
- Ionized calcium is the physiologically active fraction (~45–50% of total serum calcium).
- It is tightly regulated and unaffected by albumin levels, making it more clinically reliable than total calcium in sick patients.
- Values may vary slightly by analyzer and laboratory — always check your institution's reference range.
- Normal total calcium in this age group is approximately 9.0 – 11.0 mg/dL (2.25 – 2.75 mmol/L).
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