Reticulocyte Count · high result
What does a high Reticulocyte Count mean?
Short answer
Reticulocytes are brand-new red cells. A high count means the bone marrow is responding — appropriately to blood loss, hemolysis or recovering iron/B12/folate deficiency, or to a low-oxygen environment such as altitude or lung disease. In someone with anemia, a high reticulocyte count is good news about the marrow and points the search toward loss or destruction of red cells rather than under-production.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
What is the normal range for Reticulocyte Count?
- age 18+: 30.0 – 100 10^9/L
Often reflects recovery from blood loss or anemia, or response to treatment.
Full reference table, citations and testing options: Reticulocyte Count biomarker page.
What are the common causes of high Reticulocyte Count?
- Recovery from bleeding or after starting iron, B12 or folate treatment
- Hemolytic anemia (autoimmune, sickle cell, G6PD, spherocytosis)
- Altitude, chronic hypoxia, smoking
- Erythropoietin therapy or EPO-secreting tumors, testosterone
- Pregnancy (mild)
What symptoms go with high Reticulocyte Count?
- Those of the underlying anemia: fatigue, breathlessness, pallor
- Yellow eyes and dark urine with hemolysis
What do clinicians usually check next?
- CBC, LDH, bilirubin, haptoglobin (hemolysis work-up)
- Stool blood test, menstrual history and iron studies for loss
- Hematology review if hemolysis is confirmed
Follow-up tests available at TestWell: CBC with Differential ($21.99), CBC (Complete Blood Count) ($21.99), LDH (Lactate Dehydrogenase) ($19.99), Haptoglobin ($101.99).
How do you recheck Reticulocyte Count?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Comprehensive Anemia Workup | Panel · 8 tests | $169.99 | Yes | 3–5 business days |
| Immature Red Blood Cell Test | Test | $19.99 | No | 1–3 business days |
Common questions
Is a high reticulocyte count bad?
It means the marrow is working hard — the question is why. After blood loss or starting iron it is the desired response; with a falling hemoglobin and high LDH it points to hemolysis.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.