Serum Albumin of 4.7 g/dL in a 17-Year-Old Female
A serum albumin level of 4.7 g/dL is normal for a 17-year-old female and requires no intervention.
Normal Reference Range
The albumin level of 4.7 g/dL falls well within the established normal range for serum albumin:
- Using the bromcresol green (BCG) method (the most commonly used laboratory assay), the normal range is 3.8 to 5.1 g/dL 1
- The electrophoretic reference range is 3.5 to 5.0 g/dL, and the BCG method gives comparable values in the normal range 1
Age and Sex Considerations
Serum albumin concentrations vary physiologically by age and sex:
- Albumin levels peak around age 20 years in the general population 2
- At age 17, this patient is near the peak albumin concentration period of life 2
- Females typically have slightly different albumin trajectories than males, with values that decrease more rapidly after the peak but remain within normal ranges during adolescence 2
Clinical Significance
This albumin level indicates:
- Adequate nutritional status: Values ≥4.0 g/dL are considered the outcome goal and indicate normal visceral protein pool size 1
- No evidence of protein-energy malnutrition: The threshold for concern is albumin <4.0 g/dL 1
- No increased mortality risk: Hypoalbuminemia (not present here) is associated with adverse outcomes, but this normal value carries no such risk 1
Important Caveats
Method-specific interpretation is essential: If your laboratory uses the bromcresol purple (BCP) method instead of BCG, the normal range may differ, as BCP can underestimate albumin by approximately 0.71 g/dL compared to reference methods 1. However, even accounting for this potential difference, 4.7 g/dL would still be normal.
No further testing or follow-up is needed for this isolated normal albumin value in an otherwise healthy adolescent.