The Claim

A single, age-independent reference range for IGFBP-3 (1,199.75–3,412.6 ng/mL) is sufficient for healthy Korean men aged 19–40, while IGF-1 requires age-specific reference intervals due to its progressive decline with age.

Source: Serum IGF-1 and IGFBP-3 levels in healthy Korean men aged 19–40 years: a cross-sectional analysis of reference ranges and seasonal variation

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
44score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Description
1 study reviewed
In plain English

For healthy Korean men between 19 and 40, one standard range works for IGFBP-3 blood levels, but IGF-1 levels change as you get older, so you need different ranges for different ages.

See the scientific wording

A single, age-independent reference range for IGFBP-3 (1,199.75–3,412.6 ng/mL) is sufficient for healthy Korean men aged 19–40, whereas IGF-1 requires age-specific reference intervals due to its progressive decline with age.

What the research says

1 study

  1. Study: Serum IGF-1 and IGFBP-3 levels in healthy Korean men aged 19–40 years: a cross-sectional analysis of reference ranges and seasonal variation

    This study found that in young Korean men, IGFBP-3 levels stay about the same no matter their age between 19 and 40, so one normal range works for everyone. But IGF-1 levels go down as men get older, so each age group needs its own normal range.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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