Srivastava Index Calculator
A complementary tool for differentiating microcytic anemias
Last updated on: July 4, 2025
Srivastava Index Calculator
What is the Srivastava Index?
The Srivastava Index is a simple formula calculated by dividing the Hemoglobin (Hb) level by the Mean Corpuscular Volume (MCV). It serves as a supplementary screening tool, similar to the Mentzer Index.
It is used to help distinguish between two common causes of microcytic anemia: iron deficiency anemia (IDA) and beta-thalassemia trait (BTT).
Why is it Used?
- Offers an additional, simple mathematical clue in the differential diagnosis process.
- Can be used alongside other indices like Mentzer and RDW for a more comprehensive initial assessment.
- It requires no extra tests, as it uses values readily available from a standard Complete Blood Count (CBC).
Interpreting the Result (Reference Guide)
Index < 0.10:
A value less than 0.10 is suggestive of Beta-Thalassemia Trait.
Index > 0.10:
A value greater than 0.10 is suggestive of Iron Deficiency Anemia.
Important Clinical Note
This index, like other similar indices, is a screening tool and not a definitive diagnostic test. It has limitations and its accuracy can vary.
- A definitive diagnosis always requires further testing.
- Tests like serum ferritin, iron studies, and hemoglobin electrophoresis are essential.
- The clinical context of the patient is paramount.
- Consult a hematologist for a conclusive diagnosis and management plan.
This page has been medically reviewed by Dr. Khoulah Attia – PharmD, Immunology Specialist.