Normal Serum Ferritin Reference Ranges for Indian Adults
For Indian adults, use serum ferritin reference ranges of 20-250 μg/L for men and 20-200 μg/L for women, with iron deficiency diagnosed at ferritin <30 μg/L in the absence of inflammation, or <100 μg/L when inflammation is present. 1
Reference Ranges for Indian Population
The most recent ESPEN guideline (2022) provides standardized reference intervals that apply to general adult populations including India:
Important Context from Singapore Data
While specific Indian population data is limited in these guidelines, a 1998 study from Singapore (which has a substantial Indian population) showed that Indians had significantly lower ferritin levels compared to Chinese and Malays 2:
- Indian males aged 30-69: mean 132 μg/L
- Indian pre-menopausal females: mean 30 μg/L
- Indian post-menopausal females: mean 85 μg/L
- Pre-menopausal Indian women had the highest rate of iron deficiency (23.0%) using ferritin <12 μg/L 2
This suggests Indians may naturally have lower ferritin levels, making appropriate diagnostic thresholds even more critical.
Interpreting Low Ferritin Levels
Without Inflammation (No Active Disease)
Ferritin <30 μg/L indicates iron deficiency 3
- Ferritin <15 μg/L confirms depleted iron stores with 98% specificity 4
- Ferritin <12 μg/L has 100% specificity but only 61% sensitivity 4
- The 30 μg/L threshold is recommended as it balances sensitivity and specificity 3
With Inflammation (Active Disease Present)
Ferritin up to 100 μg/L may still indicate iron deficiency 5, 3
This is critical because ferritin is an acute-phase reactant that rises with inflammation, potentially masking true iron deficiency 4. In inflammatory conditions:
- Ferritin <100 μg/L OR transferrin saturation <20% = iron deficiency 5, 6
- Ferritin 30-100 μg/L = likely mixed picture (true iron deficiency + anemia of chronic disease) 5, 3
- Ferritin >100 μg/L with transferrin saturation <20% = anemia of chronic disease 3
Diagnostic Algorithm
Step 1: Check for inflammation (elevated CRP, clinical signs, active disease)
Step 2: Apply appropriate ferritin threshold:
- No inflammation: Use <30 μg/L cutoff
- Inflammation present: Use <100 μg/L cutoff
Step 3: If ferritin is borderline (30-100 μg/L), check transferrin saturation:
Step 4: Consider additional markers if diagnosis unclear:
- Mean corpuscular volume (MCV) - typically low in iron deficiency
- Red cell distribution width (RDW) - elevated in iron deficiency
- Soluble transferrin receptor - elevated in true iron deficiency but not affected by inflammation 1
Critical Pitfalls to Avoid
Do not use ferritin <15 μg/L as the sole diagnostic threshold - this misses a substantial proportion of iron-deficient patients, particularly problematic given that Indian women already show high rates of iron deficiency 2, 7, 8
Do not ignore inflammation - chronic conditions (IBD, chronic kidney disease, heart failure, infections) elevate ferritin independent of iron stores, requiring the higher 100 μg/L threshold 4, 6
Do not rely on ferritin alone in inflammatory states - always add transferrin saturation to the assessment 5, 3
Recognize that "normal" laboratory ranges may underdiagnose iron deficiency - recent evidence suggests physiologically based thresholds should be higher (around 25 μg/L for women and 22 μg/L for children) to detect functional iron deficiency before clinical consequences develop 9, 8
Special Consideration for Indian Women
Given the Singapore data showing 23% of pre-menopausal Indian women had ferritin <12 μg/L 2, Indian women of childbearing age warrant particularly careful evaluation. The combination of menstrual blood loss and potentially more vegetarian diets (with phytate binding of dietary iron) creates higher risk for iron deficiency in this population 2.