Last Updated on July 16, 2026 by Dr. Bhagat
JOURNAL METRICS·Updated June 2026
Blood Impact Factor 2025
Blood Impact Factor 2025 is 21.5 (Q1, Hematology, SCIE). The flagship journal of the American Society of Hematology, founded in 1946, remains the single most influential publication dedicated to blood biology, hematologic malignancies, and transfusion medicine worldwide.
2025 METRICSBlood Impact Factor 2025 & Ranking
Clarivate’s Journal Citation Reports 2025 assigns Blood an impact factor of 21.5, reinforcing its position as the preeminent journal in the Hematology category. Published by the American Society of Hematology (ASH), Blood has maintained Q1 status for decades, reflecting the society’s commitment to publishing practice-defining research. The journal’s h-index of 540 speaks to an unparalleled accumulation of highly cited work spanning over seven decades of continuous publication.
| Metric | Value | Source |
|---|---|---|
| 2025 Impact Factor | 21.5 | JCR 2025 |
| JCR Quartile | Q1 | JCR 2025 |
| CiteScore | 28.5 | Scopus 2025 |
| SJR | 5.8 | Scimago 2025 |
| H-Index | 540 | Google Scholar |
| Category Rank | 1 / 79 journals | JCR 2025 |
| ISSN | 0006-4971 | ASH |
| Publisher | American Society of Hematology | — |
HISTORYBlood Impact Factor Trend (2017–2025)
Blood’s impact factor trajectory reveals the journal’s adaptation to evolving hematology research priorities. After a steady climb through the late 2010s, the metric surged during the pandemic years as blood-related COVID-19 research generated extraordinary citation activity. The 2025 value of 21.5 represents a mature stabilization above pre-pandemic baselines, suggesting that structural gains in the journal’s visibility have persisted.
| Year | Impact Factor | Quartile | Trend |
|---|---|---|---|
| 2025 | 21.5 | Q1 | → Stable |
| 2024 | 22.1 | Q1 | → Stable |
| 2023 | 21.0 | Q1 | → Stable |
| 2022 | 20.3 | Q1 | ↗ Rising |
| 2021 | 25.5 | Q1 | ↗ Peak |
| 2020 | 22.1 | Q1 | ↗ Elevated |
| 2019 | 17.5 | Q1 | → Baseline |
| 2018 | 16.5 | Q1 | → Baseline |
| 2017 | 15.1 | Q1 | → Baseline |
Key Takeaways
- Blood’s 2025 Impact Factor of 21.5 places it at #1 in the Hematology category.
- With an h-index of 540, Blood ranks among the most historically cited journals in all of biomedicine.
- The journal has held Q1 status in Hematology continuously for multiple decades.
- Published by the American Society of Hematology since 1946, making it one of the oldest continuously published specialty journals.
- Blood is indexed in SCIE, Scopus, PubMed/MEDLINE, EMBASE, and BIOSIS.
ABOUTWhat Is Blood Journal?
Blood is the official journal of the American Society of Hematology, delivering peer-reviewed research across the full spectrum of hematologic science. Its scope encompasses hematologic malignancies (leukemia, lymphoma, myeloma), hemostasis and thrombosis, transfusion medicine, stem cell biology, gene therapy, cellular immunotherapy including CAR-T cells, iron metabolism, red cell disorders, and benign hematology. The journal publishes original research reports, review articles, clinical trials, and educational “How I Treat” pieces that directly inform clinical practice. Under Editor-in-Chief Nancy Berliner, Blood has expanded its digital offerings with video abstracts and podcasts to complement traditional article formats.
CATEGORYHematology Rankings
Blood dominates the Hematology category with its 2025 impact factor of 21.5, outperforming specialized competitors by a considerable margin. The closest rivals include Leukemia and the Journal of Clinical Oncology, though the latter spans broader oncology territory. Blood’s primacy is further cemented by its role as the official publication of the world’s largest professional hematology society, ASH, with over 18,000 members globally.
COMPARISONBlood vs. Other Hematology Journals
| Journal | 2025 IF | Quartile | Publisher |
|---|---|---|---|
| Blood | 21.5 | Q1 | ASH |
| Leukemia | 12.5 | Q1 | Springer Nature |
| Blood Advances | 7.8 | Q1 | ASH |
| Haematologica | 10.5 | Q1 | Ferrata Storti Foundation |
| British Journal of Haematology | 6.5 | Q1 | Wiley |
FAQFrequently Asked Questions
What is the Blood journal impact factor 2025?
The Blood journal impact factor 2025 is 21.5, ranking it #1 in the Hematology category under Clarivate JCR 2025.
Who publishes Blood journal?
Blood is published by the American Society of Hematology (ASH), the world’s largest professional society serving clinicians and researchers in hematology with over 18,000 members.
Is Blood a Q1 journal?
Yes, Blood is a Q1 journal and holds the #1 rank in the Hematology category according to JCR 2025.
What is the ISSN of Blood?
The ISSN of Blood is 0006-4971 (print) with electronic ISSN 1528-0020.
When was Blood journal first published?
Blood was first published in 1946 and has been in continuous publication for nearly 80 years, making it one of the oldest hematology journals in the world.
Is Blood open access?
Blood operates under a hybrid model. Subscribers receive immediate access; authors may choose to pay an article processing charge (APC) to make their article open access upon publication. ASH also publishes the fully open-access companion journal Blood Advances.
